Ima use Ambiorix. I'll probably use one of the others for their catafalque. https://www.wikiwand.com/en/Lucterius is an interesting one. 

Pretty good! The current Roman civilian texture is a toga. This tunic would make more practical sense for working. I'd love to see how a toga would look with your normal map techniques! A side note, we should try to make more realistic/accurate footwear too. 

You shifted it upward away from the belly area?

Well, possibly you can define an automatic benefit for that ally? IIRC, some heroes provide allies with benefits in some cases. Possibly the same mechanism can be reversed to provide these benefits automatically from certain civs to yourself? Nevertheless, it sounds rather complex.

I'm not sure, but I don't think we have anything for that; maybe something related to technology would have a similar effect, but I have no idea how it could be done.