I would not suggest this, but its what i did to my 55g, I tried it twice before and both times it failed bad. but i learned, and this one it going to last!
Its just two of those racks from the grocery store that go on the freezer doors so they can sell you more crap.
I also built an over flow for my fuge, but I have not posted picts yet. that looks like this...
cost me about $5 plus silicone/cement i already had.