Yesterday I was about to buy a router table to replace my lousy, warped, old, cheap table. Being cheap, I first looked around at how to build one, but part of the problem is that the insert is expensive (if you buy it). Then I saw a Jack Well's post showing that if you use a Porter-Cable 690, you can build an ultra-simple table with no insert -- just attach the router base to the table. The table I made cost $5 -- $3.75 for the surface, and the rest for a few stainless steel screws (10-24 x 1"). The surface gets placed on top of one of those portable work tables. Nothing original here; just sharing how simple this set up is. I'm going to make another one that's wider than this. The surface after drilling and the hole saw: Note that the cheapest WorkMate doesn't work without modification because the two top surface pieces don't separate quite enough for the Porter-Cable base. The pictured table is a Skil model. Here's with the router adjusted to maximum height: View from below. The on/off switch is easy to get to. Edit: If you're not aware of the Porter-Cable 690, height adjustment is made simply by twisting the router in the base.