Hello. I have just finished joining and glueing up the two doghole strips and the top slab.
First I milled the 8 3/8” wide slab top to length by crosscutting it roughly and using a router with a straight bit and straight edge to square it up nicely. With the two doghole strips I crosscut them on the table saw. I was impressed to find the saw made an almost perfect finish on the endgrain. I then marked where the threaded rod will go and marked out the position of the dog holes which are on 4” centers. I then drilled slightly oversized holes through each piece for the rod.
I joined the first strip to the 8 3/8” wide slab with a plywood spline, mostly to help with alignment during glue up.
I made the groove slightly under 3/4” so that I needed to plane the splines to fit nicely. I then used a plywood template to route the dogholes in. They are 7/8” deep and 1 3/8” wide. I also routed two splines to join the two doghole strips to each other, also to help with alignment.
Note the further distances between the first and last doghole, this is to avoid the legs beneath the top. It also turned out to provide more space with the splines.
I lastly looked everything over and proceeded with the glue up. I glued the first strip to the top and let it dry for maybe 45 minutes and then glued the final strip on trying not to get too much glue squeeze-out in the dog holes.
-- And whatsoever ye do, do it heartily, as to the Lord... Colossians 3:23