Thank you all for the nice comments. The CRT test showed no emission in the test apparently, but I do not have enough details to know how exact or complete the procedure was. It was with clip leads onto a few of the CRT pins (as you would expect; I doubt there are any CRT testers with a socket for the 15GP22), and I do plan to do further testing. I have a B&K 467 CRT tester but I do not have the "universal adapter"-but this is an excuse to get the parts and make one!
I am waiting to get details of the cabinet refinishing. It is indeed a lighter color than the un-refinished areas on the edges, but it looks very nice overall.
Here are a few more pictures:
Inside of front panel insert.
Front controls, with extra potentiometers to replace original concentric ones (in right-side area).
Zenith(!) temporary back cover.