I don't know about the Chest Mate DT jig, but the Prazi putti chaser for removing putty from divided light windows was/is a joke!!!
Jay, I found a place with a CNC waterjet table here in town! I'm probably going to pick up a big piece of granite from the guy in Beaufort and have the local guy make the cutout if the price is right. I visited his place yesterday and chatted. I didn't have a drawing with me, but he gave me an off the cuff quote of $75. If I can talk him down to a little or get him to trim one end then may give it a go.