That's how it was done in the '50s & '60s. often using metal electrical conduit pipe. My uncle built a very nice special, MG ish but Triumph based. All done with hand tools no welder, no electric tools, and proper rivets, hand drilled and set! With all the inexpensive power tools and access to fittings we have now, it makes it easy. There weren't many regs then either.
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