Hi John, you are about the same age as me and with the same sort of experience. I bought a box of off cuts to practice on before I started welding on my car. I used arc welding throughout but I am lead to believe that mig is easier and faster - you don't need to clean the slag off. I went the flat pack chassis route - glad I did as it worked out well and the support from the 2 Andy's at Saturn has been outstanding.
Best of luck with the build.
Enoch
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