doesnot the ends of the tubes need to be round?
Not if you use oval lugs (there are some, not only oval, but also more exotic like Columbus MS, Columbus MAX) or if the build is lugless (tig welding, fillet brazing, e.g.)
Your beloved GILCO design:
@Dutch_Cheese started
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Not if you use oval lugs (there are some, not only oval, but also more exotic like Columbus MS, Columbus MAX) or if the build is lugless (tig welding, fillet brazing, e.g.)
Your beloved GILCO design: