Quote Originally Posted by tuggyne View Post
If you solved all those engineering problems, it'd be kinda interesting to run a campaign around, I think, but definitely more Isaac Asimov than Tolkien.
Probably a little more like Larry Niven, but your point is well taken.

Although...
A wall of stone is 1 inch thick per four caster levels and composed of up to one 5-foot square per level. You can double the wall’s area by halving its thickness. The wall cannot be conjured so that it occupies the same space as a creature or another object.
I don't see it being able to be stretched any more than double per the description. Are we just extrapolating here, or are we just applying that sentence multiple times? I guess with a generous reading we could do that.