The 8 foot bench in Schwarz’s book has two sets of legs. My 12 foot bench will have 3 sets. While it probably isn’t needed, I decided to use the drawboring technique that Chris Schwarz describes. The technique drives dowels through the tenons, with the holes in the tenons set 1/16 inch closer to the shoulders than the holes in the mortised piece. Hammering the dowels in, draws the tenons deeply into the mortise. It really tightens up mortise and tenon joints, and has the side benefit of eliminating the need for clamps while the glue sets.
This marks the use of 4 boards of the 14 purchased. Only 10 more to dimension and put to use.