ORIGINAL: majortom-RCU
Actually the building up of diameter with masking tape or other paper concoctions is an old trick that I've put to use many times over the years. It works a lot better than you might think.
One more question. CST recommended to put a wooden inserts into the tube (short piece of dowels) where wings meet the fuselage to protect the tube from crushing. I can easy make such pieces on my lathe but is it necessery? I have never seen CF tube with inserts. Or maybe I looked in the wrong place.
RysiuM