It doesn't get much more rigid than this. I need to dress the ends of 9 pieces of 3" X 2" X 1/4" rectangular box stock, 18 ends in all. Some of the pieces are 31.5" long. I made a jig using a piece of 1 1/2" steel plate as a spacer and a piece of aluminum 2" X 2" angle as a fence. The stock is clamped to the plate and the fence. The tool holder is a piece of 1" square steel bar drilled and tapped to hold the cutter in the four jaw. Works better than a mill. Probably couldn't do this in a mill.