The cut-out was done with a jigsaw, cut the top piece of 1/2" Baltic birch first, then used that as an edge guide with a trim bit to match the second layer of 1/2" MDF. The bottom layer is 3/4" ply and the hole was cut slightly smaller to create a 1/2" lip for the plate leveling screws.
Again, this project was done using cabinet shop cut-offs and 'found' items, with the exception being the piece of BB ply. The 3/4" plexiglass was an experience to work with, but I just found a local source for 3/8" Phenolic and will be making another top in the next couple days.
The first table built works much better than what I had before, but as mentioned above, a lot is learned from making a 'first' table, which will make the second and any following tables that much more 'personalized'.
Eventually I'll be purchasing a Vacu-Plate system, but I think this table and the next one will get me by for now.