I've just finished going through this thread and there is some stunning stuff in here.
Did you ever finish those hills? Given how nicely done your bases are, it be interesting to see what you do with scratchbuilt terrain.
Thanks Nutty, the idea is solid as far as creating the hills go, the problem I ran into was the physical size and shape for the hills as I wanted to be able to put models on top of it in a tiered sort of manner. It's sort of OK if your army is still on 25mm bases, but if you start catering for 32mm it gets real big, real quick. I instead use it to create features for terrain, like this, which helps to give you more LOS blocking.
I think this idea suites where GW is taking things better.