Seeing that you're looking at making your first shot with FM8 + AS, the CC3+ issue isn't pressing at the moment.
I spent about half an hour this morning seeing what the possibilities are, because I've never tried to make the kind of map you showed us before.
I started with the map of the Mos-Eisley-type settlement, duplicating the basic terrain and road layout. I didn't like the blandness of the original, so I chose more colorful sand textures. But that's not necessary:
Sci-Fi Sample.jpg
Anyone who wants to open this map in FM8 to see how things were made can download the original file here:
https://www.vintyri.org/downloads/sample_sci_fi.zip
After that, I tried to duplicate some elements of the
"Mos Eisley" map on the left hand side of the test map. The original was hand-drawn and somewhat irregular in shape, so my duplicate also is a bit irregular. If this was a serious map rather than a test map, I would not have left things that way. In the rest of the map, I tried to create things in somewhat of the style used in other samples that you showed.
Please understand that this is a quick-and-dirty test to determine what can be done with FM8 (and probably also with CC3+) rather than a demonstration of what FM8 can do. If I had been making a serious map, things would have looked much better. There would be much more detail, special effects would be applied, etc. Shadowing is the only special effect in this map.