Here is a picture of the top of a 1932 Plymouth roadster. You may note that part of the side curtain is attached to the windshield post. I don't plan to change a thing about the top. I have the original top, side curtains, and even the "boot" to use as patterns. The top bows will need to be restored, but are intact.
I saw a roadster interior on the Jalopy Journal's Hokey Ass Message Board (H.A.M.B.) that had a plaid insert in the seat. It looked very period-correct for what I'm trying to do. The interior of the 1941 Chrysler Highlander shown here is something like I envision (with a more red-yellow plaid), but perhaps with bucket seats.
This week (7-17-2012), Dan got the windshield assembly aligned and assembled and was able to set the top in place. This is all part of the "pre-assembly" process to make sure everything fits and that no parts are missing. Next, we'll tear it all back down to resume work on the chassis.
On the back of the upholstery was imprinted the following:
So, it seems that the upholstery was put together in May, 1932 and was made of a material called "Leatherwove." It turns out that this product, Leatherwove, was a synthetic leather made by the L.C.Chase Company of Boston, Massachusetts. Here's part of an ad they ran in 1918:
Remarkably, along the edges, where the "leather" was tacked, the color, an original crimson, is still quite bright.