I can't speak for AP or PVC, but I can say this: I wrap my glass enclosures in 1/2" foam board insulation, with the foil side facing in and it helps immensely with heat and humidity control.
As far as aesthetically pleasing, it's easy enough to paint and make look nice. And seeing as you'd only need to put it along the bottom since you've got PVC, it'll be very easy to make "disappear".
I haven't worked with Bob yet, but will be when I do complete my enclosure upgrades. His reputation speaks for itself. I wouldn't hesitate to follow his advice. You can get a 4×8 sheet of 1/2" for less than $15. I'm not sure about 1", but you could always buy a sheet of 1/2" and double it up and still have extra.
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