I was just brainstorming (very dangerous, and painful) about a router table. I am trying to come up with a low cost alternative to store bought ways. How about 1 1/2" gas pipe, polished in a lathe and running in 2, 1” long Delrin or Nylon bushings spaced about 6” or more apart. Then filling the pipe with a rigid material, maybe fiberglass reinforced concrete or another material. Any suggestions? Epoxy or other plastic? Also, running a 5/8” dia. piece of rebar through the middle, centering it with caps on each end, maybe even pre-stressing it a little before it sets up. Would the pre-stressing add to ridgity without the added weight of filling the pipe? I realize the accuracy would depend on the job of polishing. But would this setup be rigid enough?