I like the idea and it looks nice except for one thing: the square-shaped buttons. Why not keep them round-shaped? I feel like they strike out too much.

I have a suggestion.
I noticed that you changed the color of the transparent menus. Instead of grey, they are now brown. But...what about removing the transparency once and for all? I mean, try to replace the transparency for an opaque texture.

One suggestion I would give though is to make it easier to tell if I have unit abilities toggled, its a little difficult for me to see the outline around the icon.

Ok. So I've read your feedback and I've decided the following:

I'll update this UI with better outlines for icons.
I'll create also a variation UI for the barbarians with round-shaped buttons, which I'll upload seperately.

@Boicote, I'll have to experiment with this first before I can make any promises.

Cool mod I hope you manage to get it working so we get unique UI's for every faction. Do agree that the round buttons look better. Just change the accent collor of the buttons to that of the faction (Roman is currently red) and combine that with "unique" faction appropriate material textures. Would be nice if you could somehow create semi transparent material textures as I like the transparency, just not that they are without texture.