Fantastic stuff, Aly.
I need to make some proper toy soldier-style hills. I'm less inclined towards the square Wellsian hills than terraced hills like the ones I made from foam ceiling tiles when I was twelve, based on - I assume - something Don Featherstone had in one of his books.
Peter Young just used magazines as hills, which never impressed me.
A new, improved, better-explained version of the rules is ready. I will put them up on the Yahoo group, and also send you a set directly.