The cycles on that site are very charming. It would be nice to have a detailed technical description of them.
There were several 'project' BMW's at the Barber Vintage Meet this year. I observed the meet attendees really interested and taking notes on the them. They were all generic builds. That comment is nothing negative about those builds. It is just that it seems the OUS (outside the US) builders really take on very technical builds w/ their BMW 'project' machines. They push the technical and art boundaries, which is really cool.