I'm thinking about building a router table extension for my table saw. I don't
have room for a free-standing table and I'm tired of pulling out and setting
up my bench top router table every time I need it.

There are all sorts of inserts available, everything from $25 for undrilled
aluminum on eBay to $350 for a Bench Dog Cast Iron complete kit. $350 ain't
happening! ;-)

What should I be looking for in an insert and maybe a fence? I'm certainly
open to recommendations for a specific insert that someone is happy with.

Thanks!