Jon,
Who every does the job has to work with the way your frames are set up, as well as the current snaps, and awning rail on the cabin top. Just don't settle for a "pattern" job, or you may find many fittings which are in the wrong place.
I am one who has had some variable experience with King. The camper back for the 25 was not at all good--sure it worked, but comparing with a good custom job, it was not good. I posted the sloppy work on the current King Canvas camper back, where none of the snaps ere properly "set".
If you were there, and supervised what was done I am sure that King can do a good job--but I would make sure that they made it fit to your boat--not to their templates.