@Mrc - there is chance for Polish Uhlan's model and icon, although currently I am not 100% sure
I will look if I can help with other icons (I know nothing about 3d models :d)
By the way, why aren't you going to use Indian Infantry from Ethnic Units as Sepoy model? And there is not a single ethnic European chariot as Carpentom model?
Also, today I learned how to create building icons for Civ5 - what do you think about this Riad icon?
I can edit that - just give me hints what to correct and which tools should I use

I have chosen this depiction of Riad (A riad (Arabic: رياض

is a traditional Moroccan house or palace with an interior garden or courtyard.) because it fits Moroccan colour scheme, is nice, depicts water and a plant, doesn't look very modern and suits Civ5 not very bad.
If you appreciate that - I can create icons for other missing stuff, this is fun
(how to create Civ5 style sunburst? although it probably wouldn't fit here)