Ok, got the bench started. I'm going to try to do this like "Run My Renovation" where I try to incorporate your suggestions. All within reason of course. Here's a few pics of what I started. I used a vanity from one of my bathroom renovations then framed it to give it strength. My next step is to Spar Varnish the plywood to give it a smooth surface.
All scrap lumber I had laying around. First expense will be the varnish.