The Hot Box incubators do have a very nice design and seem well built. They just seem a little expensive to me. Keep in mind the price on their website does not include shipping. But if price is not an issue they seem like really nice incubators
I believe Hot Box does custom build incubators if you send them the specs you want. I would contact Yovan for more info: yovan54@hotmail.com
Natures Spirit incubators builds theirs from 10mm expanded PVC. I'm not sure if Casey builds his incubators with customs specs or not but I think it's definitly worth contacting him and asking considering his excellent reputation: thirtypt@aol.com