Nah, I get that. Space is a premium, especially when trying to run perpetually. The idea of cardboard + wet flowers just begs mold issues to me. Hell, even drying in a bathroom would be better, a bit of a bitch having to move plants around every time you need to bathe, but at least it's not a stagnant air box. Given I don't know anything more about your living situation, my best advice is consider any other options you have. Personally, I don't dry in my tent either. I dry in my garage. Also not ideal temps, and not perfectly dark, but the bud turns out just fine regardless.