Here's a bait-tank I whittled outta Starboard a while back...all router cuts...no saw ... round lid; made a radius arm screwed to bottom of router for perfect circle... all lids; made a jig for router to follow ....radius arm and jigs made of masonite ...all cuts require 2 passes w/a 1/8" plunge bit in 1/2" material...3 passes in 3/4" material ... saw blades are great w this stuff, but if a router will do it, it leaves a SMOOTH egde w/ NO sanding needed... 8) ...