I'm using an Eastwood TIG 200 AC/DC set around 80A. The foot pedal is a little tough to get modulate and to me it's still binary. I do plan on welding in harness brackets and some battery mounts. The 818 I'm starting will be electric similar to Erik's build, but I plan on going the DC route. Each box should be roughly 100-125lbs. so I figure angle iron between cross members would be sufficient. I'll be practicing some more and will try a fillet weld. All the tutorials I've watched seem to indicate flat welding is best to start out.