I found a place to buy 3/4" baltic birch plywood and started working out the design of the rocker fixture. Here are the results so far.
As you can see, the central panel swings both directions so that the platforms on the top can be set once in the process. If you aren't familiar with original, you might understand it once I shoot the videos.
Here are the platforms that the router runs on. If you click on the images, you can see them larger.
Just a few slots and hardware to make the platforms adjustable and I'll be ready to route. It's almost worth all the splinters... almost.