posted 07-20-2014 01:28 PM ET (US)
Hal, In order to get a satisfactory product, I think you will have to do some research and have one custom made.
The lack of superstructure on that model boat will make a camper extension a little more complex (mounting an extension to a T-Top, Hard Top or Radar Arch is much easier).
Ask around at the marina for recommendations of the best canvas shop in your area, then contact that shop to see if they are willing to work with you on the design and implementation. If not, move to the next recommendation.
A lot of canvas makers are competent, few are really talented fabricators... You want one that falls in the latter category. Expect to pay for it too.
I could recommend excellent shops in SE and W Michigan - but it's a long haul from MN.
Good luck.