Are there any B&B owners located in Michigan? I recently saw a factory five roadster with a custom soft top manufactured by Rod Tops
ROD TOPS - Hot Rod Convertible Top Systems & Accessories
The top looked great because there are no snaps/buttons holding the back end down, they use something like a turnbuckle to keep the frame rigid down to the trunk - it only attaches to the windshield and the posts just behind the door. They are pricey, ~3k.
The only way they could make one for a B&B car is to have one stop by at their location so they can get the measurements they need. They're located in Ellsworth, MI - which is unfortunately up by the UP and about an 11 hour drive from central NY.
If there's any B&B owners that live in that area and willing to stop by there, after winter of course, let me know.
Thanks,
Matt