Just a little update on Trey.

I'm happy to report that I have the temps and humidity completely under control at this point, thanks to all the info I have gotten here. He also has two identical hides, newspaper and paper towels as substrate, and he still has his tree which he still really likes. hehe

His cloaca looks completely healed to me. The only problem I see there is that there seems to be some sort of bony mass right on top of it, which I can't explain. I googled python skeletons, and I see nothing in the pics online to account for this. I will be consulting the vet about it!

He definitely looks a lot better, no more signs of dehydration at all. I'm very pleased with that.
Only other problem to report is that tonight, I gave him his shot and changed his water and newspaper out. When I put him back in his tank, he climbed his tree, and I noticed that he has developed a bit of a wobbly head!
I took him back out and went ahead and tube fed him, even though it made for the third time this week. The vet said to do it twice a week, but my instincts just screamed at me to go ahead with it tonight.

He's a fighter, though, and I'm half Irish, so if sheer determination is enough, he will make it through this!