Anybody here ever built your own spot welder? I've got some major re-assembly work coming up on my jeep tub & I've been thinking it might be easier/faster to do real spot welds instead of the "drill hole/mig weld plug/grind down" route. I've found a few references on google to plans for units using re-wound microwave oven transformers, intended for use on small projects such as model gas turbines, but there isn't enough detail to convince me they'd work on heavier sheet metal.
So, if you have any experience with something like this or know of any on-line resources that google (Gasp!) doesn't know about I'd appreaciate hearing from you.