I did, so I whipped up one of these out of scraps. Got the idea from Lumberjocks, wasn't comfortable with just a butt joint between the card holder and the base so I set a panel pin into the base, chopped it off about 7mm above the surface, then drilled up into the bottom of the card holder at a guesstimated angle. Worked okay, but I may have to think up a jig if I make more.