Cut your plywood down to fit the length of your mattress and for the height you want minus 7 inches.

Find the center and mark it with a pencil.

Cut the 1/4 inch boards down to 12 inches in length.

Put your first 1/4 inch board on the plywood and using the triangle square make sure it's at a 45 degree angle.

Nail it down then continue on to the next piece.  Keep working your way down the plywood.

Once you finish nailing all the 1/4 inch pieces down cut the frame to size and connect to the plywood using the kreg jig.

The finished Herringbone Headboard