There are several custom canvas shops in the area - Top Shop in Sister Bay (920.421.1417) Larry Blagdon is the owner. The other is Dockside Canvas in Two Rivers (920.793.3759) Dave Smith is the owner.
These are the two that surfaced after a bunch of looking around. I'm in the middle of a camper set with one of them so I'll hold my opinion until the result is known. Both seem to enjoy an excellent reputation for the work they turn out.
Good luck!
I'm a 410 with a new white stamoid camper about three rows from the back and near the middle of bldg 1. Get in touch if I can help. Try a PM here or ask Mike M at QDM for my number.
Best to go with your OEM Supplier. If you provide them your hull number they will have the pattern. For my 52 Sedan Bridge the canvas and strataglass supplier was Gioia Sales. Located in NJ and FL.