Mo,
It seems the wheel can be used to determine bent spacing:
http://www.cressingtemple.org.uk/Adrian%20Gibson/Wheat%20Barn.htmSo the wheel can be used for floor (plan) as well as elevation (wall) framing.
Where is Ken? We need an English chap.
bmike,
I think we're just trying to lean how the Daisy Wheel worked, not jam all building design into this one particular formula.