I really love this army. So much things here and there.
The different height of the bases is a very interesting point. My bases are always flat and all the troops are on the same height. It's somethign i will change in the futur, now.
Did you thought of taking some Battle sized Squig to represend a giant squig for WM ? With gobs riding it ? Maybe a platform, etc ? A hero could be represented like that easily.