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Good point Euclid, but make sure Shaotzu, if you don't use the canvas, to make sure you are using pastes, not sprays. Foam core board is paper surfaced and fluids of any kind will destroy the surface.

Shaotzu, foam core board cut 3" x whatever you want (actually 12" is most likely the best), heavy duck cotton cut 5" x 14" if going with the 12", rubber cement duck cotton to the foam core after...

Before you go 4 sided paddle and all the abrasives in the book do a bunch of research in the Library. You will most likely find that Crox is the abrasive of choice with small desenters in favor of...