I have acquired a 21" Trinitron XGA monitor for my Tempest cabinet. Based on some quick measurements, it looks like it will fit nicely (sans shell) into the existing wooden monitor frame, although I'll have to work out the mounting brackets.
Unfortunately, based on the same measurements it looks like I'm going to have major problems with the depth of the monitor. The monitor is ~19" deep, and it looks like there's only 12" at the top of the cabinet. I will be making more detailed and accurate measurements, but I'm not hopeful.
Any suggestions? I'd rather not run it with the rear panel off (better to keep out kids & cats), so I guess I'll have to build something. Well, it was missing the panel anyway.
But for anyone else thinking of putting a big monitor into a Tempest cabinet, be forewarned!