Winner of worst welds in the world goes to me. First time I touched it, I melted a hole in the 1x1, and ended up taking about 3 hours to do all of it, plus grinding off all of the lumps I left. Dialing the amps back a bit (200 -> 40) seemed to help.
Sanded, primed, 3 coats of satin. Had my father lay down the paint. He would've done a better job on the weld too.
Installation:
Plastic sheeting between dissimilar metals, stainless bolts with anti-seize, nylon nuts. Tested to hold my weight bouncing on the end of the ball mount. Planning on adding some eyes to the bottom of the car for safety chains before I pull a trailer with it.
$18 receiver
$20 bolts / washers / 1x1 steel tube
$4 paint
$16 in diesel for the welder, got the rods for free
EDIT: Should add, no part of the hitch is lower than any part of the undercarriage.