You can certainly get an effect like that just using the normal DD3 symbols and drawing tools. I did something of the sort for Wyvern Citadel in the Community Atlas in 2021. The Forum topic on that's here, which gives an idea as to how I arrived at the final concept. That's shown on this shot of the ground level of the fortress (which shows the cliff lines the clearest):

There are higher res versions of all the maps in my Gallery, while you can pick up copies of the Atlas FCW files for the drawings here.

Not sci-fi, since they were all done for the Nibirum Community Atlas, which is all fantasy mapping, but they were done in the general style of planetary-system mapping, so may still be of interest. However, I did a series of maps for said Atlas back in 2018 - Forum thread here, Nibirum Solar System start page here, with a sample map to give you an idea, just for the inner planets:

All these maps are also in my Forum Gallery here.

Glad you'd got the test resolved Jim; not ideal news from the result, obviously, but great to see you were in good spirits, and it can be fixed.

Been offline till today myself, or I'd have commented sooner.

Best of luck for the next appointment, and beyond, naturally.

Well, I'm still hunting for the connecting sewer symbols to let me create a sewer layout for Parchment City (hey, it says I can do this on page 1 of the PDF Mapping Guide for it!) 😉😁!

[At a not-so-wild guess, that's an accidental copy-over from the March Annual!]

Sure, Jim. I looked around in the Atlas, worked out where there were area maps smaller than continental-size, drew up a list of those, and then rolled some dice to find places to fit the total of 52 maps I had in mind. Duplicates were re-rolled, so no area would get more than one new map. There were more such areas than I needed, so not every place ended up being selected. I also removed a few areas that were quite heavily mapped already (or had reserved sites on them), and there were a couple that were too small to be viable for what I needed.

When it comes time to finding somewhere for the maps to go on the chosen area map, I then just look at the selected area map and pick somewhere that looks suitably interesting in it, maybe in a sub-area map if there's something suitable, or if not, I'll draw something myself, though not more than about 30-40 miles per side at most. In this case, I felt I'd been really lucky to have found a nicely small area map in the Serkbergen region which had some unused interesting features right in its centre; if I'd been drawing the area map myself, I couldn't have aimed it much better!