Here are a couple of parts made from plain old pine from a big box store. The board they were cut from looked a lot like the curly board they are resting on. The beauty of having a brutally powerful vacuum pump is that I can pull a board like that flat and make good parts out of it.

 Here’s a closeup. These parts are straight off the machine, no sanding has been done. Chipping and cracking on the corners and tearout on the holes has been prevented by picking the right bits, keeping them wicked sharp, and clever programming. The holes in the ends were drilled with the cross dowel drill fixture.