chassis table/jig

How have you guys built your tables/jigs? What materials did you use? Things you would change if you built one again.

Probably a little overkill, but I bought and modified an old Bear alignment rack. I cut off about 2 feet where the turn tables set. Is now 14 feet long. The width is adjustable.

This was my economy table. Made out of 2x12 spruce. Screwed together for easy disassembly.

I'm building one right now.
Here's a link to the album:
https://www.facebook.com/#!/media/set/?set=a.10150841209841314.398282.565066313&type=3

Of course you'll need a Facebook account to see it.