If you have the coins go 220v for sure but don’t think you can’t tackle virtually all the necessary welding with a smaller welder. I used a 110v MIG with gas for all of my welding. When welding sheet metal you’re going far too fast if you’re running into duty cycle issues. DEFINITELY tag and bag every single part…without exception. What you’re positive you’ll remember will be long forgotten in a 2-3 year period. I took 850+ pictures of my rig as I disassembled it. My recommendation is to take a picture of the general area of the part so you know exactly where it goes, and then take a pic of the part specifically. Make sure you include the bolts removed in the baggie when disassembling, even if you don’t intend to reuse them. I took it a further step and measured and wrote on each baggie the length and thread pitch of every bolt because I knew I was going to replace all the hardware. Made it a lot easier putting everything back. I also bought a bunch of cheap food storage containers to store larger parts.
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One last thing I would recommend (I didn’t do this but I wished I had) was restore/refurbish parts you intend to reuse as you remove them. It may keep the project on track. Versus having a million things to refurbish before putting it back together again, which can be overwhelming when you realize the work involved. Just my .02¢.
Most important thing is to double what you think it will cost, have fun, and don’t be afraid to get in over your head and try something you don’t think you’re capable of. You might just surprise yourself. Prior to my resto, I had never done anything even remotely close to a frame off. In the end I did absolutely everything (minus the leather upholstery) myself, including the paint. It was a helluva journey and one I’m super proud of accomplishing.