I looked over the PDF and that's way more than KISS. I can square up two edges in my table saw and fine tine the squareness with the hand held router One that's done, I can use the saw once more to cut the length and width about 1/16" larger than I need. From there, the fence setup I'm using will, one pass at a time, shaving off a few thousandths each pass, make for a custom fit. I can shave off the thickness of a piece of paper if I so choose. The rectangular holes that I route into the floor will of course have rounded corners. I'll hand file the fill/repair piece to match those rounded corners in the floor.