Quote fromOr you just use Sm.Ash to coat the tops of your buildings to protect them from the acid. While I don't think ash panels should form on the ceiling, I think they make perfect sense for a a Sm.Ash to place a panel when used on a block.
That... huh. That actually works. 'Kay then.
Sniggy does have a point though; even if Ghasts are big, they don't feel like it. It probably has something to do with the fact that they are everywhere (which I guess this would change, but still) and also they're usually far away enough that you don't really even realize it. A huge, hulking monster that actually challenges you would really be nice. Maybe you could make the Troll/Ogre/whatever bigger, or just give him a bigger brother or something, but yeah.