I think you'd be amazed how easy it is. You can make one from Sunbrella material if you take a template of what you will need with an old sheet etc. I took battery terminals and pex plumbing tube for the frame. The terminals allow it to pivot on the blocks you screw to the deck and the Pex is flexible and strong, even in freezing temps (cheap too)...
I'm sure there is a tailor in your area that will sew it for you once you have the template right.
Get on the NJ forum and troll around, I am sure you will have many bites...
Pics of boat?
"I've been left for dead before but I'll still fight on, don't wait up, leave the light on, I'll be home soon"