Anybody out there bought a kit greenhouse? I'm looking into them and would like some feedback from anyone who's used one or knows about them. The Harbor Freight ones get some pretty mixed reviews - almost all the Youtube reviewers made modifications to make them stronger. I don't have much room so I will be getting a small one - probably 6'-7'W x 8'-10' L. Most in that size use 4mm polycarbonate sheets and I'd like to get 6mm if possible. I've looked at a 6mm one from Climapod but it's too long. I could build but can only employ wood technology as I can't weld aluminum and wood in a greenhouse = upkeep.