These are just some additional photos of the island cabinet in the middle of our kitchen. Mrs. Underground Carpenter and I have been sick for a few days, so posting here braked to a halt in the last week. The above photo shows the back "skin" of the cabinet being glued on. I use PL400 construction adhesive. It works better than whatever the factory tried to glue theirs on with. Oops, I ended a sentence with a preposition. Now I'll have to rap my knuckles with a ruler.
This is a "remodeler's box". It has a toggle-bolt-like fastening hardware to secure it to the cabinet.
The back side of the remodeler's box and the inside of the cabinet. You can see the clip that holds the box in place.
The wire comes up through the bottom of the cabinet and into this mounted box. From that box our electrician will run a lead to each of the two electrical boxes on the cabinet. He'll use MC cable which is a metal-sheathed wire.