The rear stretcher mortise is layed out. The
tenon on the rear stretcher is offset - flush with the top edge of the
stretcher. The mortise is centered on the join-line of the side-rail
timbers.
The hardware joining the side rail timbers goes through
the mortises, both front and back. This holds the whole thing together
and in alignment.
The front mortise is cut, ready to accept the front
stretcher.