Hi Glenn,
We are happy to provide baseboard & library files for the connectors but were wondering what the best/preferred ECAD file format would be. I know Eagle is a popular one but KiCAD seems like a pretty compelling option as well, especially considering it's totally open & free. If you/others have a suggestion we can get those posted.
Note: there are some weird limitations for PCB footprint and layer count for many of the free versions of these programs. The connector fanout is easier with six layers; it is possible with four, however then you start running into PCB size constraints. Just something to keep in mind.
-Ryan