I made one from plastic shelving and 32QT Sterilite locking tubs.
http://i1086.photobucket.com/albums/...Ball/Rack1.jpg
Hold 10 tubs and was quite simple to modify. I just cut all the legs down so that it left a just enough room to slide the tubs in and out. I also used 4" flexwatt in 3' sections running along the back of the shelves taped down with aluminum tape and connected to a Johnson Controls tstat.