Some remodeling of my building delayed things a bit (workers traipsing in and out) but I've simplified the PCB (all components on the same side) so it should cost less to purchase assembled. I've ordered a dozen bare boards. I'll assemble and test a couple and, if all is as planned, will assemble the rest and send some out to those who asked to be included.
For those reluctant to perform brain surgery on their CM15A, I plan to resurrect another design (using the TDA5051A powerline modem chip) that will do PLC I/O and have options for RF I/O, WiFi, Bluetooth & battery-backed RTC and will have separate (universal) powerline interface(s). It will be a few more months down the road and will cost more, of course. The controller will come assembled (options will plug in), the powerline interface(s) will have all SMD components preinstalled but users will need to install the through-hole components. It will use the same brainwashed/re-educated Arduino Pro Mini processor so the firmware/software will be the much the same.
While waiting for the PCBs, I'll work on revised PDF documentation for the CM15A2Zv2b brain transplant as well as documentation for the controller plus powerline interface(s) and upload them to my webpage (online courtesy of Laser Systems).