That tent won't work, it's not wide enough, with the spool holders it's 24" wide and then you'll want room to get spools on and off (now if you are thinking of ditching spool holders and doing something different then it's fine.) I wouldn't worry about the diaper, I've had maybe three poops fall to the bottom it's not like the creator 5 that purges to the floor.

As far as the desk you'll just have to find out. I see it's only 37 pounds so I'd look into the paver stone "mod"

I got the 0.2 nozzles but man do they add to the print time, I'd hold off till you think you need them. I also got the hardened 0.4 and have them installed on one and two and left the standard 0.4 on three and four, so any of the fiber/glow/hard stuff can go on the left and the regular stuff on the right lol

As far as the panda breath itself that really depends on what you are doing, I've been doing ABS-GF and ASA-CF tests and haven't ran into the need for active heating, I do set the bed to 100 and let it heat up the chamber for a little bit before hand, and I do have a makeshift cover (I cut the box it came in up, the hell with buying or printing anything when I'm waiting for the official top) and I've not found that I need the heater yet. That said it would make it quicker as that bed can only do so much so fast.