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Lugged and MAPP is fine, slow and you need lots of good quality flux as your'e hanging around hot as the flame is colder than oxy fuel, but I built my first frame with MAPP, lugs and two bits of wood for alignment..... it was wonky, shit penetration and didn't fit, but that was user error not tooling.
Or tube blocks on a flat surface and tig the whole thing? Also, make sure the drop outs aren't cast if you want to weld them or you're going to have a bad time.