Looking to build my own test bench.

I'm looking for an aluminum or other metal system where I can cut square tubes to length then attach them using prefabricated connectors and screws. I think that this is a common thing but I don't know where to begin my search to locate these items.

I'm building and open air case for a new folding at home farm. I plan to have four or more video cards and will be keeping them cool.

Something like this would probably be about perfect. No idea on price though.

http://www.directindustry.com/prod/...ame-housing-aluminum-profile-7243-434679.html

http://www.lowes.com/pd_55970-37672...t=metal&pl=1&currentURL=?Ntt=metal&facetInfo=


http://www.lowes.com/pd_216100-3767...t=metal&pl=1&currentURL=?Ntt=metal&facetInfo=