Since I started this hackaday project in medias res, as it were, I think I'll start with the current status and work both backwards and forwards. As of today, the register memory is about halfway complete (input, output, and three of seven registers, plus a zero register), and the ALU is 80% complete (just a few more shifters to install). Here's a video of the first Spikeputor "program", which is really just a hard-wired loop between the register memory and the ALU. Nonetheless, I have something that can perform successive additions on each clock cycle.