Ok, I finally got some photos of my bench. I've been remodeling my office, because it looked like a grenade went off in there. The sheet rock was all messed up, the ceiling had water damage from a leak in the old roof, the linoleum flooring did not cover the entire floor... It was not a good looking space.
I'm still working on it; I have baseboard to go around the floors, and I'll need some 1/4 round to cover the gaps where the walls meet, but the bench is done.
The sheet rock on the back wall came out completely. I ran some new romex, and added several outlets. Then I covered it with 3/4 in ply. I took good notes on where the studs were, so when it came time to install the bench, I was able to hit the studs every time.
The shelf on the bottom is 2x4 with a 3/4" sheet. It is bolted to the studs on the back wall and supported by legs in the front. The bench is supported on the back by a 2x4 bolted 6 times to the studs on the back wall. The front is all 4x6 beam.
The side supports were notched into the 2x4 on the back, and the 4x6 on the front. I also cut a 1 1/2 inch notch out of the 4x6 for the two sheets of 3/4" ply to sit so that it is recessed on the top.
When I bolted it all together I concealed all the hardware so nothing is seen in the front.
This thing is SOLID. With two layers of 3/4" ply on the top, that gives me a 1 1/2" deck, supported by the studs on the back, and a 4x6 beam on the front. I'm fairly certain that when I get the press bolted up there won't be any movement.