Modelling with planes?

[Mudbill]

I don't think you'll need to worry about performace when using planes, because they are of the simplest geometry to render. They only consist of 2 triangles, whereas a monster like the Grunt may consist of 2,000 on its own.

The only reason it's not much used is because it's difficult to place a thousand planes in order to construct something. You'll probably be better off making model of it, but if you want to use planes, sure, go ahead.