This got me to thinking that it wouldnt be too difficult to build a baseplate to attach a trim router to one of the old Portalign drill adapters. The motor would easily fit between the rods. A piece of plexiglass with a couple pieces of hardwood attached for the guide holes. Perhaps brass bushings to reduce wear? The Portalign has an adjustable depth stop, the guide rods can be set below the surface to act as alignment pins. What do you think?
Mike