I think I just answered my cruck question. Been going back over the posts, specif. the one where Ken quotes Laurie Smith:

"Leigh Court barn near Worcester has nine cruck trusses and two end walls. According to Michael Peach, the architect in charge of the restoration many years ago, there were few carpenter's marks on this building. He did however, spot a daisy wheel and, having had access to his measured drawings, I discovered that it has a five daisy wheel in line floor plan and daisy wheel truss design. The barn is 33 feet across (exactly 2 medieval rods) and has the biggest cruck span yet discovered."

So I guess the wheel can be used for more than your standard square-timbered frame.

Re-reading the posts on this thread is something I've found necessary. A lot gets glossed over on the first run-thru...