Ben Chong posted his RC2014 6809 CPU board, that is available on github.
More details on his blog.
Scott Lawrence has written an article detailing his Z80 homebuilt computer, the RC2014:
The RetroChallenge is upon us again!
This time around, I plan on working on my Z80 homebuilt computer, the RC2014. (Website for RC2014, Order a RC2014) For a few months now, I’ve had my RC-2014 computer built, and modified to be an RC2014/LL computer. What this means is, is that I have some modified modules using no additional external hardware.
The above picture shows my RC2014/LL system with its extra RAM module, and the C0 Serial expansion board to the left, with the SD card interface board (SSDD1) on it.
Project info at Scott Lawrence’ blog.