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Here is the finished product. I learned a lot and am planning on doing another one to improve on things. It isn't perfect, but is a tough, weatherproof, countertop for my table.
It was fun learning the concrete mold and pouring process. I would recommend anyone trying it. Not including the mold materials and misc, the actual concrete here is only about $7.50 (about 1 and 3/4 80# bags). A quote for granite top was $400 with the 21'' cutout hole, so doing concrete is an attractive alternative. For an outdoor countertop, I think it is a good choice.