The hunting market is hard to break into for a few reasons.
1) Majority of hunters are very tight with their money and look to penny pinch anywhere they can, and when it comes to blinds with these type of hunters they choose to build their own. I say this because I am one of these hunters, I have the ability to build my own and do so.
2) The hunters that have money fall into two categories. Fully furnished hunting lease hunters where they buy into a lease for the year and everything is already on site, but they manage the assets. The next category is the pay hunt, where the hunter just simply pays an outfitter for an the entire experience and they just show up with their gun.
3) The individual hunters that would consider purchasing their blind are typically located in major metro areas and they will typically look locally around their lease for blinds.
If I where to get into the blind building business I would have to secure one or two avenues first. Obtain a purchase order from a sporting store like a bass pro shops or similar outfit. Another avenue would be obtaining a maintenance contract or purchase order from outfitters. I wouldn't go after the individual hunter since for one the market is already flooded with options, and two the area in which you can realistically reach is not sustainable for any business unless you get a store front in a hunting town and sell other hunting related items corn, batteries, feeders, etc.
Approaching sporting supply store and outfitters would be the safest bet to establish a sustainable business. But these kinds of endeavors require a salesmen approach and you have to be able to bring demo's with you, and in these demo's they have to set it apart from the rest of the competition. In addition it is kinda late for these kinds of endeavors, since hunting season is right around the corner and these conversations should have started months ago. However all is not lost for next year, this year you could build a few units and to get setup pictures, testimonials, maybe even promo videos. That way when the conversation start next year with sporting stores and outfitter you have more than a product to show them.
Good Luck and hope this view helps.