Glass Pyramid

A hollow 1x1x1m pyramid made out of glass, with the inner faces visible.
There should only be a very small amount of ambient lightning and a small amount of specular lightning, so it’s nearly clear.
The glass should be about 1cm thick.
If it isn’t possible to get translucent objects in the pyramid rendered correctly this way then I request an inner and an outer model instead.
The pyramid doesn’t have to be hollow collision wise, but it should collide.

Reference:

It’s for a volumetric display with 2D mode, so the inner bottom face should use a different material than the other faces.