So I got the idea from a friend, I built a new rack from 2" foam insulation. I used 50 qt tubs thay are shorter in length than the 41 qt but are much wider. I built it for my big female pastel and plan on putting other females in there also once they outgrow there 28 qt tubs. I still need to put my flexwatt in and run it for a few days and see how the temps run from there I will decide if I want to put a back piece on it. overall its pretty sturdy for being made of styrofoam. I used 4" screws to hold it together and the black tape I put around the edges was just somthing I did it to keep from having pieces of styrofoam from flaking off all over the place, because it comes in full size sheets and has to be cut down to size. sorry about the crappy cell phone pic.