Portable Workbench

First

I saw this http://www.instructables.com/id/Multi-Functional-Portable-Workbench/

Got me thinking that it would be really neat to build a simple work bench/table that would fold into a self-contain portable form.

Other

Based on this: http://www.instructables.com/id/Collapsible-Workbench/?ALLSTEPS

I was thinking about another portable bench. The top would fold up, clam-shell, but long ways. If the top of each half was one piece of plywood, it would be 8x2. I like the plywood bench I saw a while ago, and I'd be interested in mimicking it's structure for the legs. So rather than 2 2x4, the legs would be hollow plywood with a reinforced rib structure. This should produce something both lightweight and strong. This design also relies entire on rigid structures. It may be possible to build something very strong by having the leg-braces push the legs out and have wires pulling the legs in to create a strong, static structure.

Medium Compact

A good middle ground would be something about 8" thick that could just fit in my trunk, or maybe just fit with the back seats down. Something like a 1/2 Paulk bench. I think I could get most of what I need out of a circular saw and a drill. Need a quick way to setup repeatable miter cuts. It would be really nice to include some dust collection.