Dave,
Here is my 2 cents...
Right now there is a pretty broad spectrum of boats that meet the needs of most hunters. There are already boats that cover the whole spectrum (folks like Ira, Lou, Dave, Mark and others here manufacture some of the best ones available).
A dimension you could persue is to produce something that competes with an existing niche and compete on some product differentiator - make it cheaper, safer, more versatile, you name it. Make a v-hull like the Alaskan for half the price with all the same quality, make a layout that weighs 60 lbs and comes with a free tow harness, make a marsh boat that is is inexpensive as the kara but as safe and effective as the momarsh DP, make a bay boat that doesn't turtle like the carolina skiff, something like that.
Frankly, I think you have a bit of an uphill battle unless you can differentiate your product and satisfy an unmet want or need.
Who specifically is your target market? As some others have pointed out, duck hunters are a diverse lot. You won't catch me out on the broad lake in the north country here with a pirogue - and I doubt someone in the grass filled shallows of florida wants a 20' high sided v-hull.
Are you looking to provide a mass produced product, a mass customized product or a custom product?
Want a mass customizable product idea? How about this - sell a lightweight composite shell that can be used to convert a common v-hull into a TDB style covered boat blind. Make it removable for the off season with clamps like a hard tonneau cover. Make the mold design flexible so it can be customized to the specific shape of the owner's boat. Think out of the box like Southwest Airlines - compete against someone other than boat makers - for example: make the price compete with the high end pop up blinds on the market.
Want another - create a camoflage shrink wrap product that can be used to quickly camoflage a fishing boat, with no adhesive, provide various camoflages, and also a paintable model that can be used for do-it-yourselfers - and on top of that make it cheap enough that replacing it is not a major investment. (think of winter boat wrap with a flat camoflage surface)
I'd be glad to test your prototypes on my lund...
Charlie