So, I'll start:
I'm very new to doing my own welding. In the past, I've helped plenty of people do MIG, but any welding I had done was generally under some heavy observation. So now I'm branching out and doing some light duty welding to get more comfortable and learn to be self-sufficient. The wife knew I had wanted a welder for a while and she found someone local selling off a Miller XMT-304 CC/CV box for a fair price. He had cut the power plug off the back, so all i had to do was wire in a new 240v plug, pick up some cables, and I was good to go.
For those not familiar with the XMT-304, it's a constant current/constant voltage power source that can handle all sorts of welding processes from stick, to MIG (gas and flux core) and TIG. So far, I've only done some practicing on stick while I save up to pick up a MIG wire feeder and a TIG torch for it. Even just doing stick work with it, I'm impressed. I was afraid it might be too much welder for working on car steel, so I've been practicing on thin gauge steel (usually around 16-18g) and it's pretty good about not burning through.
I need to build a cart for it, and have been looking at pre-made carts for inspiration. I want to leave some room for add-on units and make provisions for holding small gas bottles. I've been curious why some carts have the welder at an angle, and some leave it flat. Are there any positives to having the box at an angle? I figure I'll set the power source on the lower shelf, and then build a shelf above it to put the wire feeder when I get it and just hang my cables up in a cabinet so I can swap them out as needed.
Unless I find a comparable, and maybe even cheaper, wire feeder that is compatible with Miller's 14 pin control system, I'll be looking for a used Miller 22a wire feeder.
As for a TIG torch, I have my eyes on a Weldcraft unit. Either the WP17 or WP26. The 17's rated for 150A and the 26 is rated for 200A
Here's the only picture I have of it so far:

