I'm focusing on the seat components first so I can work out any kinks in the M/T process.  The components that form seat sides have a single mortise for the front stretcher and a double mortise for the rear stretcher.   The mortise jigs are similar to other ones I've made in the past:  They have oval openings to cut the mortise using a 5/8" router guide bushing and a 3/8" bit in a plunge router.  To allow one jig to work for mirrored sides, there are friction-fit indexing pins that slide from one face to the other.  In the past I've used dowels.  This time, I'm using Dominos since they were on-hand and their length was just right with no cutting.

The jig for the front seat mortise can index the very tip of the side component.  Since my computer model didn't exactly match the shape of the side component (earlier on, I had eye-balled the MDF templates and sanded them down until I was happy with their shape), I could not make the index Dominos flush on all sides of the work.  Instead, I used the top edge and tip of the side component as the main references and then offset the lower Domino to accommodate a wedge to hold the work snug.

The jig for the seat's rear stretcher mortises was made in a similar way.  The main difference here was that longitudinal placement of the jig required using alignment marks on the jig and the work (rather than indexing off an end, which was too far away to incorporate into the jig).  The empty Domino hole is where I had initially placed the wedge pin.  After seeing how close it was to the mortise hole, I thought that the wedge might possibly distort the mortise opening, so I cut a different hole for the wedge pin.

I made the jigs long enough to allow for two clamps, which will prevent any shifting while routing.

Seat mortises after routing. 

Next, I'll work on the seat stretchers with integral tenons.