After devoting a lot of personal time over several months to this project, my attention has necessarily turned elsewhere. Activities such as client projects, where an internal release is pending at the end of this month, have priority. They are paying the bills, after all.
That said, I have not abandoned this project. I still plan to release the Verilog source for my 4004 CPU implementation later this month. Also on my "to do" list for later this year is characterization of the DRAM array, and the layout of the remaining four PCBs to complete the CPU.