After spending considerable time staring at the two sets of plans, it finally clicked and I build the jig for making dogholes. It was quite simple once I got going with it.
I didn't have the ideal router bit for the job so I had to use a combination of my two routers. I used a 5/8 straight bit with a collar on the big router to clear out most of the material. Then I used a top bearing, 3/8 straight bit in the Dewalt to ride along the jig and clean things up.