TIP cabinet has the glass mounted on the outside of the wall. Once the glass was "toast", I went to Lowes and had a sheet of 1/4" plastic cut into 4 pcs. I use the inner shields that TIP sells, so the glass will last quite a long time.Make sure you get one with a square glass. When it gets cloudy, a glass shop can cut you a new one, rather than having to order one.
I made mine from Plywood also. It has a 3x5x2 work space. TP tools provided the glass, valve, gloves, lights and other hardware. Built it in one weekend.Make one. I built mine out of plywood and 2X4's. I used regular glass, but put window screen on the inside, it prevents pitting of the glass. It was designed to be taken apart in sections so it's easily stored. One thing that is necessary is to have a blower to keep the air clear, as it fogs with rust pretty quickly. Most important is to buy a dust mask, that is rated for this work.