To this end, I've converted some Bantu buildings from Humankind (which means this cityset can also be used for Bantu derived civs

). I know hrochland made some houses on stilts for his Aborigines citysets, so I will study those when I optimize these assets for the civ4 engine.
I have a few questions, and any help will be greatly appreciated:
1) Should I scale these buildings up or down in Blender? Or should I make adjustments in the xml fScale?
2) I've kept the dds files at their original 2048x2048, but I plan to scale them down to 512x512... unless it's possible to use 1024x1024?
3) I figure I'll need to reduce poly count (via decimation). The current file size for individual houses ranges from 7~32 kb. What is an ideal range for each individual cityset mesh?
4) The more complex buildings are 80~113 kb. Bantu House Central 1 & 2 are particularly large. Perhaps these would be better used as UBs? Do I need to reduce polys in this case?
5) Shadows, shadows, shadows. How on earth do I make them or adjust preexisting ones?
Thank you very much in advance for any suggestions or guidance