However, there's nothing in CC-BY-SA that requires the files we distribute to be editable, and not just Gerbers. It's a key point of the OSHW definition that the distributed files need to be source files, not Gerbers/photomask which are roughly equivalent to compiled down object files.
Thanks for the great summary and state of things as they stand today.
I think it's great (and necessary) that OSHW does require easily obtainable source files that are editable.
I myself am not too familiar with the process of fully disclosing all source files for hardware. I'm guessing there's a bit of a learning curve one has to go through just to make a nice, scalable set of source files that anyone can read, understand, and easily modify.
This whole idea has me thinking about the concept of a SPIME
-- coined by Bruce Sterling in his book Shaping Things
. Ideally anything created would be planned, and designed, to be cradle-to-cradle. That way the creative process would not contribute to excessive physical waste during the evolution of a physical design.