GVCS Wiki has about 2000 pages of documentation. Much of it is incomplete because the project as a whole is perhaps 15% complete (based on number of finished machines), but it's a good source of information. http://openfarmtech.org/wiki/Main_Page

Are you using "Free" in the sense of "zero price", or in the sense of "under an open license and free to modify"? Those are quite different even though you can lump them together under the same word. OSE designs are intended to be free in both senses. The actual hardware as finished items are being sold at a price because the labor and parts that go into building them are not free. In the future, generous or very productive people might give away surplus machines to help others get started.

I am a fan of the Free Beer, Free Speech discussion. It is well addressed here:
http://en.wikipedia.org/wiki/Gratis_versus_libre