Here's a link, that was posted in an earlier GJ forum, to another site (EAA). This page is devoted to "standardized" workbenches they use in constructing homebuilt aircraft. The benches are 2' x 5'. Height is 33 3/4", but that can be modified easily to suit your particular needs
http://www.eaa1000.av.org/technicl/worktabl/worktabl.htm
I liked the idea of being able to put 2 or more benches together, temporarily, either "deep" or "wide" to accommodate most any project. Since I have more than enough room in the pole barn, putting a permanent bench against a wall wasn't a concern. I like these since, with casters on one end, I can wheel one or more around to any area where I'm working. I initially made 2, and plan on doing more. Also, the "leftover" sheets (3' x 4') can be made up into smaller, rolling (if desired) benches.
Viz