I've been using one of these with one of these added on for about twenty years now.
If it doesn't fit in the cabinet, I've had one of these for about the same timeframe. When I bought it, TP Tools was selling them with the SKAT name on them as well. I forget what the story was as to why the cabinets and pressure pots went their separate ways. They were always made by different companies, but had some deal to work together for awhile.
Picked it up used, rebuilt it with new internals, replaced the gloves/seals, and blew a quick coat of paint on it. Probably got around $600 into it. I replaced the plastic window with tempered glass, but still use plastic shields to keep from etching the glass. Buy the plasic in bulk rolls and cut it yourself. I actually take it to FedEx Office and use their paper cutter to slice it to size. You will be changing it often, if you do a lot of blasting rusty/nasty parts. The vac is a must. I also added a water separator.
Off the top of my head, I think it's 36" or so inside dimension (width). Probably 18" deep. Although the fluorescent light work fine, if it ever dies, I'll go LED. It has a 24 cfm gun, which takes a lot of air to run. I have a IR 7.5hp compressor with an 80 gallon tank, and it will cycle constantly during lengthy blasting sessions.