Here you go!
The wind was too high today for testing.
All should remember that aesthetics was not a concern especially for a 30+ year old Sears canoe. It was all about comfortable FISHING without breaking the bank.
The frame is 1". The cantilever ends are 1" to 1 1/4". There are 1 1/4" pieces used as bushings for the pontoon section. The floatation is held with a piece of 3/4".
My greatest concern are the cantilevers. The pontoons will displace about 10 pounds which is distributed to the four cantilevers. Each cantilever will have about 10 pounds at the beam. I hope the stress doesn't break the glued joints. I have a solution in mind if there are problems. I'll report back after testing.