I'd also check the heat tolerance of the PVC you want to use. Depending on the height of the enclosure, wattage of CHE, and quality and type of thermostat you are using, the CHE might not get hot enough to melt the PVC, but you never know. Probably risky to use a thinner PVC sheet for sure.
I've used aluminum foil in the past. Can go in the oven, so no worries with heat there. You just have to be careful not to tear it and to get it to seal pretty well (may take multiple layers). It also doesn't look great.
Ultimately, you should consider a proper PVC cage IF you are having trouble keeping heat and/or humidity in. These tanks can use Radiant Heat Panels (RHP) and heat tape, etc. and do a great job of keeping both heat and humidity in. They can also be much bigger and much lighter (relative).
If you want to go that route, many people on here use Animal Plastics and Boaphile. I have the latter and love them. Nothing against AP, I've just never used them. I believe reptile basics has some cages now too, as well as a bunch of others. Just ask if that's something you are considering.
For now, the aluminum foil could be good.
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