Firebug
Not-so Great Engineer
Seems very interesting (although I'd add a little more things involving Forests personally). However, is that ships sailing through rivers actually codable?
Well. I guess i could ask one of the long time modders. I'm sure they would of tried it at some point, if it was though....
I know it's normally not well seen to point out someone else is working on the same civ, but... your concept is pretty damn similar to Tomatekh's Kievan Rus.
I tried to avoid that, and i don't think it is too similar. I guess the UU is similar.