Fitted CS-50 to 4130 tubes which were correct length, omitting rivets for now... [Timewarp: ...thankfully as all the tubes are the wrong length. later became proficient at REMOVING the CS-50, using a 3/16" steel rod to push them out from the inside.]
Watched some EAA videos on drilling tubes and refined my drilling jig and tried some test holes on scraps.
Thunderstorms rage outside, the mains power is off, but the Tesla is sitting at 38% so I'm the only person in Darraweit with power :)