Been working on this the last month or so and finally have something to show for it.
Last year I bought a pretty gutted 19V2000 locally (frame, tube, yoke, internal wiring harness) and started collecting the parts to get it running about 6 weeks ago when a rebuilt 19V2000 deflection board showed up on eBay. Ordered the PCBs for and built a VSTCM (minimum order for PCBs was 5, so if anyone wants one...)
Got an Atari powerbrick off Ebay and a G05-802 high voltage cage from here.
Things I did before firing it up
1. Replaced fuse quick disconnects on powerbrick, they were really corroded
2. Swapped the output connector on the powerbrick. It wasn't the one I mostly saw online and I could not find the matching male connector anywhere.
3. Replaced the anode cup on the HV cage with a silicone one from the chassis of a tube donor I had in a box.
4. Redid the deflection board connector on the internal wiring harness. Yellow wire (focus? screen? I forget) was broken. Afterwards I checked continuity between every wire on the internal harness.
5. Bent a pin on the CRT neck back into place, some gorilla just shoved the socket on and bent it pretty bad
6. Straightened a bend in the frame.
So it's a bit of a Frankenstein monitor with the mismatched deflection and HV cage, but I had read posts from several people saying it worked fine for them.
I also did find a NOS tube that seems like it is a pretty good match. Electrically it all looks identical, diagonal deflection angle is a match as is the curve of the neck when it meets the rest of the tube. Yoke seems to fit perfectly. The original tube has a broken ear tab, and another that looks very close to breaking. I'm gonna try to use some JB weld to put a new ear on and save the remaining one. I'll probably give the new tube a test in the coming weeks and if it works I'll probably keep the original as a backup.
Ultimately I want to make an Atari style cabaret for it. I know they never made one with a horizontal 19" monitor, so I'll modify the plans for a tempest cabaret. Also grabbed a beat up owl eye door for it eventually.