Is your plan to lift all of this in to zbrush? It will be ALLOT of work for you. I would say, model like 4-5 stone blocks with well thought details in them, reduce them in decimation master or meshLab and then place them in you scene. Same goes for the ground stones and the pillars. Think aobut you UVing before you start…
Yea I totally agree with matroskin. You could still use some highpoly pieces to make a tileable texture set that you could use all over this piece, I think people think doing a highpoly means each piece has to be unique, when in most cases having 3-5 awesome tileable textures and a couple trim sheet textures enables you to…