Features coupesters w roadster windshields

A friend and I were looking at the coupster thread. He is wondering exactly how it is done w/o changing out the cowl. 32 stands were mentioned in one case. A or 32 windshield? custom width? He is missing everything from the belt line up on his 29 and a prior owner cut the door window frames off then tacked them back on. Anyone?

 

This is how I did mine, 31 Model A Stancions & windshield. Home made mounts on the cowl.

 

Here's how mine was done it's a 30/31 coupster

 

The cowl of a closed '28 - '29 Model A is approximately 45 inches wide. The bottom of a '30 - '31 roadster windshield is 43 3/4" wide, the top is 44 7/8" wide. Give you any ideas where to begin...?