Step 11: Fit the seat boards
Screw a seat support along the front rail 1 1/4" down from the top.
Measure between the front and rear rails, to determine the length of the seat boards. They should be approximately
20 1/2" long.
Cut the seat boards out of 1 1/2" x 5 1/2" wood.
You will need 9 boards. One may need to be ripped down in order to fit.
Cut the seat boards and fit them, but first apply a run of glue along the seat supports.
Fix by way of screwing from underneath - through the seat supports into the seat boards.