Four rooms left to complete now. The first two were fairly straightforward, a lower barrack-room for the temple staff and guards below part of Banys Hall on the surface, and a shared space for some of the temple priesthood:

These were followed by combined study and bed chambers for the leading priests, which necessitated adding cross walls to both the last two rooms, and fresh doorways, as well as somewhat more sumptuous furnishings:

That completed the main map drawing, which left the labelling and layout, plus I decided to add a grid, as I often do for dungeon drawings. I tried with a 10-foot grid spacing at first, but the offset walls, and non-standard width areas in places, because of the adjustments to fit to the pre-existing surface features, meant that wasn't helpful, and looked quite messy. So I went with a 5-foot grid instead, although that too looks uncomfortable over that northern segment, where the diagonal floor tile lines clash with the grid in places. It seemed OK for the rest of the map at least, and people can always turn it off, or amend it, in the FCW file if they don't like it.

It only needed adding to selected parts of the whole drawing, and without a walls mask sheet, that meant a grid mask was going to be required, with another chance to break-out the magic of the Color Key sheet effect:

Looks quite impressive here, less so with Color Key off, to show how it was accomplished:

Thanks to the complex and off-axis shapes involved, I'd quickly created a new drawing tool just for this Color Key mask, because that allows the tracing of already-created polygons, of course. And once the remaining strident pink sections were added, the magic was complete:

The perceptive will have noted too that one basic layout action has happened while all this Color Keying was ongoing, moving the map's title. More such juggling followed, as also with the labelling, to reach this final version, gridless, then gridded:

The usual higher-res versions have been added to my Gallery as well today.

The outline arrow for the surface entrance from Maleng Hall was just a little drawn polygon linear shape using the snap-grid, and the upper part of the background map area has been shrunk to better fit the final map's layout, using the Stretch command on the Map Border and Background sheets. 

Not quite ready to submit these maps for the Atlas yet, as the PDF notes are still to complete, so I'll post again here once they're done and the maps have been sent-off to Remy.

Beyond what Royal Scribe mentioned, if you've only used basic graphics manipulation programs for mapping before (such as Inkarnate), you may struggle to get to grips with CC3+ at first, because it's a true CAD software package, and works in a rather different way.

If you haven't already, I'd definitely recommend reading and working your way through the tutorials from the PDF CC3 User Manual (despite the name, it is written for CC3+ users; you'll find it in the Profantasy => CC3Plus => Documentation folder, or just click the "Help" drop-down menu in an open CC3+ window, then click "User Manual"). I can't stress enough the importance of doing this, rather than simply trying to make your own way through the program, if you have no prior experience with CAD software. Many folks (including myself) tried that, and ended up hugely frustrated until we sat down and actually learnt these basics properly.

There are other written tutorials available on the Forum and the ProFantasy Blog. This topic has a list of options, although they are mostly dealing with specific elements, not just how to map with the software.

Good luck, and if you get stuck, feel free to ask again here!

First order of business on resuming the mapping was, of course, to shrink that northeastern pair of chambers:

Having also fitted it with the same grey flooring as the connecting areas though, I was having doubts about persisting with that, as it started to feel too much that it was segregating the whole northern segment from the rest, and wasn't really continuing the level-colour idea I'd begun with. So I changed it back to the green tiling, and once the rest of the northern area flooring was completed, that slight mismatch angle in the linking area didn't seem as noticeable (hopefully!):

I have made one concession to "reality" here, however, in giving what will be the lower kitchen, and upper kitchen's cellar, a cobbled floor, as hard-wearing and less fancy seemed much the order of the day for such a place.

With the main structural elements complete at last, it was time to start adding the decorative ones, furnishings and the like:

One notable amendment here was adding glow symbols for all the wall torches, and candles in the great circular temple chamber. This makes them easier to identify, and provides some further indication of the difference between the two temples - fewer torches in the lower section. This happened almost by-chance, as I'd missed seeing the glows sooner, given they're at the end of the furniture collection, with the candles, rather than in the wall features catalogue, where the wall torches are. Needing to add candles to the lower temple meant I found them - eventually!

Pressing on into the northern segment, I wanted to add quite a few bits of scenery in the Kitchen/Kitchen Cellar particularly, which included a couple of stoves by the northwest wall, where an unseen flue would link to the surface chimney outlet, a couple more stove-lengths beyond the nearest wall (as a quick check with the otherwise hidden chimney bitmap sheet in the map indicated):

This also made me realise there needed to be a connection between this Kitchen and the adjoining large Dining Hall just to its northeast. I toyed with a serving-hatch notion before opting for a full double doorway - it's a big room, intended to have three tables in it from the Inkwell book-inspired notes, so easy access for staff and foodstuffs would be essential. This res likely won't show that doorway though.

Proceeding on, the Dining Hall was next, where I thought it would be interesting to add some extra floor decoration, and also in the long corridor. In the Inkwell descriptions, both are rather fancily-appointed, so I wanted to hint at that:

While all I did was add a few pale lines, using the blue water bitmap texture, as it looked quite like pale marble at a sufficiently high res (if not so clear in the narrowness of the final lines), that proved quite tricky, because of the off-axis angle of the whole northern segment. What I did was copy the floors, and realign those copies to the standard grid lines, so I could use the snap grid to draw the decorative lines to the right sizes. The final placement of the new lines had to be done by-eye though, any remaining misalignments of which were something the corridor torches and tables were intended to help disguise!

That turned out to be quite time-consuming, so the rest will have to wait for another day...

Have you tried CA209 Stairs and Steps? That has some wooden steps and some more generic "brown" steps that will work as wood or stone. If you need some plank lines in places, just draw some on afterwards. Even some of the worn, brown stone steps will work as wood - again add a few plank lines if you wish to fool the eye a little more. Old wooden steps will wear away just as the stone ones do, after all, and might be patched with different colour wood scraps. You could also "carpet" them to hide that middle worn section.

Symbol Set 2, Bitmap A, has some complete wooden stairs, darker though not reddened wood, some of which come without arrows.

With DD3, you might try mixing things up with other wooden furniture - the bench, pew, the sideboard, chests, crates (which latter two both have paler wood colours), and the planks in the Debris catalogue (though those would probably only work with difficulty). You may need to hide the edges or sides with some of the furniture and containers, but they could give alternate options for landings, say, apart from steps.

It'd probably be worth hunting around in a few more catalogues as well, as you never know what else wooden might seem suitable!

It's perhaps worth saying too that rooftops are rooftops, and haven't changed a tremendous amount over time, within a fairly limited range of forms (flat, sloping, domes/spires). In the basic City Designer 3 package you already have the option to draw your own rooftop (= house) shapes, using a variety of textures, so you can add exotic shaped pieces/materials to any ordinary roof to make them look weirder. If you'd prefer ready-made domes in a variety of colours and textures, try the bonus issue of the 2018 Cartographer's Annual, City Domes.

Don't forget too to explore the house symbols style options in CD3 anyway - Classic (loosely ancient Greek-Roman), Mideast, Thatch in the Bitmap A collection; Classic, Fantasy, Hovel and Thatch in the Bitmap B set; some of the Gothic items in both could provide some especially weird structures as well; many of the Vector symbols could be used in this regard too.