I (and by "I" I mean the hubby with me assisting) built this rack:

http://ball-pythons.net/forums/showt...UW-Big-Time%29

With a bit different dimensions. It turned out looking like this:



And I really like it but man it's HEAVY!! It was also very time consuming (hubby's drill kept dying) and more expensive. I think we spent over $250. I was really concerned about sagging so the extra melamine was cut down and I use to as spaces between the rows to provide some extra support. I ended up finding Sterilite 12qts, 28qts and 41qts that will all work interchangeably in the rows (the 12qts have a bit of space at the top so I can't put like a small cornsnake in there, but my 200g bp and 40g cornsnake stay just fine).

So for our 2nd rack we (see "I" above) built this one:

http://www.youtube.com/watch?v=DLDxk2yp2Vs

And it turned out looking like this:



And I really like it. It's lighter (although still quite heavy...but I can scoot it around without too much issue), went together quicker (we did it over 2 evenings), and was cheaper. Also, I think I am going to buy another set of shelves and add 2 more rows onto it (again...see "I" lol). Hubby calculated that it will work for 41qts and 28qts so that's good too. I'll probably end up building another one turned sideways for 41qts. I don't mind the open sides, as one side is up against the other rack, the back is against the wall (we actually used the leftover pegboard (eucaboard) and screwed it to the back. It pretty much completely covers. So there's really only 2 sides exposed. My snake room is kept warmer so the flexwatt doesn't have to work as hard. The thermostat has a % readout telling me how hard it's working and I very rarely see it at anything but 10% or 20%.

I would love to buy a rack...but they're just so gosh darn expensive and, like the OP said, I can make twice the rack that I can buy for the same price. I'm always trolling craigslist for someone selling a used one, but have yet to score one.