I hooked up all the plumbing today. I used plumbers sealant beneath the sink to eliminate water seepage under and into the counter plywood. I sealed the drain to the sink the same way.

I then installed the back and upper cabinet panels.

The picture inset in lower left corner shows the upper panel consists of 2 laminated panels. The top was only 4.5 inches wide, bottom 12.25 width.
Installed the Sink & Faucet