I made this at Techshop San Francisco, using a manual mill, their large Shopbot, and their powder coating setup.
Step 1: Design
I've included the 2d drawings (generated mostly automatically from the Autodesk designs) , just as an example of how awesome Inventor is. I used the drawings in the metal shop to actually make the pieces. The slots are actually off by 1/4 of an inch in the drawing, because I mis-calculated the width of the legs, so I'll be modeling a little harder in the future to make sure I get everything aligned.