Since I have no facts to back up my view on the daisy wheel and the wheat barn....Anyhow, what jumped out to me is the floor layout could also be explained by application of the ratios in a 30-60-90 triangle and the roof slope appears close to an equilateral triangle configuration. Both triangles are to be found within a daisy wheel but the derivation through a daisy wheel is unnecessarily complicated and to layout a building by a complicated process of divding circles an projecting towards other circles which are again divided, seems overly cumbersome and not carpenter like. I will try to post later when I have more time for a full explanation.