So, I did some practice welding first, but I've always favored working on something real as a way to learn. (I'll probaby post some of my welds for feedback later.)
The finished product was a welding cart. I had 2" x 3/16 square tube for a trailer tongue extension and decided to use that for the base. I felt the weight would add good stability. The rest of the cart is 1 1/4" 14 ga. square tube and some 3/16" angle.
The one mistake I made was putting the middle shelf too low (put the top of the tube at the mark for the bottom of the tube). As a result, I had to cut off the angle that was to hold the wood shelf. Later, I'll make a shelf and screw it on top of the tube.
I still haven't figure out the best way to hang the cables (MIG & Plasma torch and power cables.)
Anybody know if there's somewhere to buy plastic plugs for square tube? I thought that would add a little to the finished look.