I had been working on a 6809 CPU board before summer 2017 called and I went back to outdoor activities.
I finally found the Eagle files for that board and uploaded them to github here.
You can also order the PCB from OSHPark here.
[Edited]
1. The initial bring up test code have been uploaded to github here. This includes a BIOS for serial console using the Real Retro UART board
2. The PDF versions of the schematic and board layout have also been pushed to github