I forgot to take photos of the top to apron mounting system but this Sketchup drawing should explain what I did. These are simple wooden clips with their tabs captured in slots that run around the perimeter of the inside of the aprons. The slot is 1/4" wide by 3/8" deep. The clips are cut from 3/4" thick maple and the tabs sized of a snug fit in the slots. Screws are used to secure the clip to the top. The hole is slightly over-sized and the screws are the type used for pocket holes- nice large heads.
The finished table is awaiting pickup-
The church members are going to apply the finish. If they send a picture, I'll add it here.
Thanks for following along and the very kind comments that have been posted along the way.