I fabbed up seat bottoms this past winter to go with some donor backs. I decided to also fab the legs. I wouldn't call it an "easy" job, but was very satisfying! You would need a grinder, welder, method of bending (i made a wooden form to bend around and filled the tube with sand), files, etc.. I am very happy with the results. Seat covers and holddown straps from Cruisercorp, 2 inch high density foam.
If you want any dimensions, material sizes, etc, let me know and I can send them over.
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