I expect I'm finished in the shop for today, I'll do the mortices early AM and mount the Paramo #52. I think once the mortices are made MsOK will be enough to help me with the slabs but I will call the muscle back over to move the two benches into final position. Just figuring the weight by the BF of Beech in the bench, my guess is the bench will be over 400 lbs. when finished.
The slabs in position and marked, as you can see there will be about a 60mm split:
A view of the mortice markings: