I've made quite a bit of progress on the base in the last couple days. I made the two battens that will tie the top to the base. These came from the long rip off one of the two slabs. I tapered the ends of them to minimize interference with legs, and also to hide them as much as possible.

Next I will be mortising the legs to the battens. The leg is easy, the battens will be a bit tricky. I'm going with a single tenon, 1/2" x 5" x 1 1/2" long. It will be centered on the leg, so there is ample room for expansion and contraction. This quartersawn maple should only move about 1/16" over the 10 inches. The setup on the multirouter for mortising the batten at the angle involves a wedge of the same angle. It maxes out the height on the pneumatic clamps. It worked well.

Next I drilled the battens for the fasteners that will connect the base to the top. The holes are first counter bored, and then drilled through with an oversize bit. The center two holes are standard, and the outer two will be elongated for movement.

The next step is to mill the trestle stretcher, and the joint that will house it in between the legs. Then I'll be close to assembly of the base. I've completed all epoxy work on the legs already, so once they are sanded I'll be ready to glue up!