Do these enclosures look salvageable?

[Bogertophis]

Some UTH "can" get hot enough to at least warp plastic, but that's why you regulate all heat sources, & follow safety instructions for setting up UTH, ie. leave a little air gap to reduce the chance of them over-heating. Still, it's one more reason I love glass: I cannot melt it, nor does it scratch easily. Also nice visibility, & also easy to insulate if needed.

I've seen some tubs modified for CHE, & yes to your general description. Again, not my favorite thing, but I suppose one can make it work safely.

Thinking ahead is a GOOD thing, but not if it makes you buy something that's way more trouble than it's worth. Those first enclosures you asked about...they'd have to pay me to take them & I still wouldn't, lol. Also, shopping for used enclosures online is a bit like shopping for a house or a car online- wait until you see it in person, be critical about looking it over, & take your time doing so. Always be prepared to say "sorry, no thank you" & walk away. It's amazing how things look perfect for our needs online, but when you see it in reality, you realize how deceptive those pictures were, & how much they left out. (I think that's because our minds see what they "want" to see- it's easy to assume the best, that it's a great deal you don't want to miss out on, lol. Good sales people know how to use this to their advantage & they rely on doing so.)