Actually, looking more carefully at Civ IV units, I don't think it'd work at all: partly because the models I used were far more detailed than Civ IV ones, and partly because I didn't use all-over skins like Civ IV ones, but just textures for various props and things where required. So even if they were 3ds I don't think it would work at all. I can PM you one if you like nevertheless, but I'm dubious!
I'm sure I could definitely get it to work. PM me one if you want to and I'll make it (but I doubt it will get any use as it would be too demanding with all the polys and multiple textures).