Ok so check on the sine wave UPS, great advice.
I would opt for something like the Cyberpower 1500, but that thing is huge and would need to reside outside of even my very large desk case.
It would be nice to be able to incorporate this into the back of the chamber, but it's slightly limiting with the chamber being roughly 6x6x60 and already has a 1000w power supply and surge protector, so probably down to half of that overall length of that 60".
I don't think DIY is something I'd want to attempt for this and it seems most of these UPS are fairly large because they're lead-acid batteries and take up a lot of space.
Is there some smaller, compact lithium-ion sine wave UPS version available?
I may just opt to skip this all together and finally read some of the books I continue to buy during a power outage...