Somebody used to sell a reciprocal tool (electric) for checkering the final small bit up close to the borders. It may even have been MMC.
I remember it being shown in GDigest(?)perhaps.
I just use a veiner with a swept back face for the job. I use the MMC to cut one pass in each direction and finish the pattern up with hand tools. It still saves alot of time over doing the complete job by hand.
I admit I have to watch the lines as I cut along with the MMC and every so often with a hand tool make sure I'm not starting to make arcs instead of straight lines.
Tedious work.
