Smokeyone,
I don't know if you can access the woodworking channel on the computer, but Bob & Rick did an episode on making trivets that might interest you. Rick cut evenly spaced slots in a section of cedar, halfway through and when he went to make the next slot, he had a block that fit into the previous slot and used the guide to cut the next one. This is, however, on a scale much smaller than yours, but the principle can be applied and do the job for you. All iy takes is a simple jig and a hand held router with an appropriate bit. You could probably adapt Bobj's jig to do this also.
Joe Z.
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JoeZ  If you never made a mistake, you never tried anything
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