well, it's gonna be pain in my 'you know what', but so far, i have splited model in several pieces, and some of them are then repeating a lot. I'll probably uv map one of them, then use same uv map for other copies aswell, but with some changes in texture to add more variation.
I have not completly decided exactly how will i do the whole texturing, but i'm trying to avoid to use loads of huge textures, so i'll to some experimenting later to see which method will be the best.

I'll report once i choose just how exactly will i do it.