Jeff,
That's done with a router. I cut 1/4" grooves in the panel, using a pattern. I flipped the pattern, routed again. I filled the grooves with 1/4" strips of Mahagony and Ash.
Cut the grooves..
Fill in the grooves..
I sealed everything in 'glass/epoxy.
Mike,
That's a template. I'll assemble the furring for the twins on it, then use it over and over again, in smaller pieces, as a pattern for other components. A good use for a couple sheets of ply I had laying around!
