Hey BigT,
Without seeing the exact product (my local Menards does not have them) I'd guess there are 1" varieties of the companies aluminum connectors available online. I have samples of both and can tell that the 1" square tubing is a MUCH preferable product to use for aluminum rack or cage construction. It would take a lot less aluminum stock to beef up the rack so it was stable enough. The 1" connectors would pay for themselves, in my opinion, just in saved aluminum stock.
After seeing these aluminum racks behinds the scenes at a zoo I ordered my own samples and started research what it would take to build my own rack.
Without getting too verbose, I was left a bit disenchanted with how much I was going to have to spend on a DIY aluminum rack and how lousy of a track system I'd have to settle for. I was more than happy to spend the money but I wanted better function.
The cheap track was going to need to be supported at three points along the length which meant more square tubing and connectors.
The angle that was rigid enough to be self-supported was very expensive and meant having to build a wider rack. The wideness was not much of an issue but the cost and function was. Ultimately I abandoned the project because I just was not happy with any of my options for a track system.
As I'm sure you've heard me say before, there are three reasons why I build my own stuff 1) to save money, 2) to achieve design features I can't find in a commercial product and 3) for the satisfaction of doing it myself.
Well once I figured out the best way to build the rack I was 1) not saving much money, 2) not happy with some of the design features, and 3) wouldn't get much satisfaction due to #1 and #2.
But still being someone interested in building stuff, I do have an opinion for the original poster.
Build a track-style rack from wood. There are plans for this at arbreptiles.com. I suggest this, of course, under the assumption that saving money is one of your goals. You will save some money if you build your own aluminum rack but the savings won't be nearly as great as the type of money one normally can save from building their own cages and racks.
At least if my calculations were correct 
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Current snakes:
0.1 Gonyosoma oxycephala - (Silver/Yellow)
1.2 Gonyosoma oxycephala - (Green)
7.6 Gonyosoma janseni - (Black)
0.1 Gonyosoma janseni - (Black & Tan)