Step 8: The Buttrest
Or the seat. Which ever you prefer. You will want to subtract the width of your side supports (mine were 1") times 2 from 18" and cut that many inches out. For example since my side supports were 1" wide each, I made my seat-boards 16" long. Repeat the attaching process from the last step. I added another nail in though. Put the bolts in when you are finished that.