I have wanted to make a set also. I am pretty sure that I can get the local Midas shops to bend the tubing to the shape I want for a pretty reasonable price and pretty quickly (I asked about it when I did some consulting for them a few years ago); they bend steel tubing as needed for exhaust systems. I suspect someone else would have to do any welding but I have a friend who has a shop that does that. Do you know what tubing thickness to use (I would want to be able to trapeeze and to hold at least two people on the wing). I had a 1984 Hobie Magnum with lightweight yet robust wings but never took measurements.