my floorboards are 1/4" Baltic Birch plywood. I used the aluminum floorboards as a pattern, cutting the plywood on the bandsaw. A 1/4" X 3/4" spruce strip joins the two parts of the floorboards. The only real trick to making them is getting the "bow" in the plywood pieces. I used 8X8X16 concrete blocks as weights, 2X4 blocks, and soaked the plywood for several hours in water.
The brake heel plates are fabricated of .050 aluminum sheet and screwed in place with 3/8 SM screws.
The floorboards are installed one at a time with #8 screws and locknuts after four coats of varnish, 2 coats of traditional spar varnish and 2 of epoxy varnish, light sanded between coats
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And then the kick panel (also 1/4 plywood) is added under/infront of the seat.
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