Thanks. Going step by step makes sense. I don't want some big misalignment to correct, and I don't really want to build a full frame jig either. What took my thoughts in that direction is a picture on the cover of the spring 2021 issue of BQ. It is of the Makino work shop in Japan, where they build frames for Keirin racers. They have this massive fixture on a table, with the frame oriented horizontally so the tubes are parallel to the table top, and it really looks like they might be doing the whole triangle at once.