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That's a good looking project. Curious why you set the checkerboard below the surface of the rest of the table.
That looks awesome! Just FYI for other potential builders, regular PVC will work just as well and is a little cheaper that CPVC. Nice work.
Seems like it might be a lot easier to just keep the egg carton in one piece and fill each hole with lint and wax. Once the wax hardens you could then cut the carton into individual pieces.