The slab for the oven has been poured, and it took about one bag of Portland cement, mixed with the appropriate amount of sand and gravel. This weekend I hope to start on the rock base, and although I thought I would use clay brick for the oven, I'm starting to reconsider. Probably I'll spend the extra money and buy firebrick.
As an experiment, I thought I'd try to also document this process in Facebook. We'll see what that looks like.