I have researched the Pennsylvania Barn as well. From what I can tell, This barn is based on designs brought by Amish and Mennonites from the Canton of Jura, who had previously fled persecution in Canton Bern. The barn shows some obvious similarities to the Bernese barns, such as the ramp leading into an upper level. The barn shows some differences from what I have seen from Switzerland though. Namely, the barn makes use of the tie below plate joint, which I have yet to come across on Swiss structures. Many Swiss building actually have a total absence of anything that might be considered a true tie beam, relying on a series of timbers that could be considered joists or minor tie beams at the same time.