I don't know how but I somehow got on farmtek mailing list and get their catalog -- and drool over the pages
Good to know they are worth it. That repair tape sounds like something to keep in mind.
What about ventilation? You mentioned fans and thermocube electrical outlet adapters -- is that the way to go? I was always intrigued by solar attic and roof fans and was at one point looking at the ones sold for Mobil homes.... Last year, I bought a screened crawl space vent with thermal open/close to use with a coldframe design I was planning, but never got around to building it. It's on my list again this year.
I also got the freeze switch thermocube to operate incandescent lights or a small ceramic heater, too. But will need to get the hot switch thermocube for a fan if I'm going to do that as well.