Thanks to Vince's earlier post here is the only known proof the prototypes were possible in 1928. This along with some parts drawings dated in Oct of 28 seem to be the only credible evidence I have so far.
http://www.fordgarage.com/pages/EGBudd130ADelivery.htm
The date on the pictures Vince has on his site beg some questions:
1) Was this the first one produced by Budd?
2) If this was the first or even the 50th, why did it take until late March of 29 for The first of the production run to roll off the assembly line?
Just some thoughts that come to mind. Rod