Looking pretty good. One thing I'd suggest is to use less of the pre-fab tree groups, as you can see the repetition quite well. Instead I'd use individual trees in most places and make my own little woodland clumps.

That's because when SS4 was released the Room and Corridor tools were not included in basic CC3+, you had to have DD3 installed. For SS4 to be usable without DD3, the tools needed to work with the drawing tools instead. Nowadays that would not be necessary. An update of the SS4 menu is probably in order, but you can simply switch to the DD3 dungeon menu (Tools > Menu) for now.

That's a known problem with the relevant part file missing from the City Designer install. This should get fixed with the next update.

In the meantime, save the attached file in the Parts subfolder of your CC3+ program data folder. Afterwards the Add City Layers command should work properly again.

Excellent stuff, amny thanks for sharing. With permission of EucalyptusNow, I've posted it to the blog.

One little note that can save a step: Instead of doing Copy and then Mirror, you can do a Mirrored Copies command (MIRCPY). You'll find this if you right-click the Copy button.

Indeed there is an error in the catalog with Dune 1 vc and Dunes vc not working correctly. I've attached fixed vc files for the symbols. To fix this unzip them to /Symbols/Maps/Mike Schley/ in your CC3+ programdata directory, overwriting existing files.

Note that you'll need to remove the symbol definition from existing maps and re-add the symbol to correct it there.