Step 4: The seat press
In a similar fashion, the original template is used to cut one of the upper pieces. The only difference with the 4 upper pieces of the press is that they are 1/2" smaller than the original template. The reason for this is that the seat will be 1/2" thick and making the upper pieces smaller accommodates this thickness. So after trimming the first piece to match the original template, a line is marked 1/2" inside the edge and the 1/2" is trimmed off. The trimmed upper piece is then used as the template for the remaining 3 pieces of plywood.
The 2 halves of the press are glued together with 2" thick blocks between the plywood pieces. This makes the total width of the press 9" which is sufficient for a 10" wide seat.