If you already have a boat fine, but if your looking, my I suggest finding one with a tiller seat and two box seats instead of a middle bench seat. Reason being, you won't be stepping over that seat all the time. In my boat I can walk straight to the bow, with nothing in my way. Everything from people to gear is along the sides; keep in mind you can customize it to fit your needs. The reasons I have two 30in doors are, I always hunt bow into the wind, and two doors allow that and I only hunt big water, so if I need to get into or out of the boat fast, the doors will allow me to. I'm 6ft 3 - 230lb, with a parka and waders on, you don't need tight doors. While moving, the canvas comes off the bow also giving me more visibility and a place to exit the boat when I get close to shore.
Not trying to show any disrespect, to those who will buy their boat blinds, there are some fine blinds to be bought. To me it's an on going process; I'm always changing something to improve it. To build it you're self, to me that's cool. There are better blinds than mine out there that you can buy. The feeling you get after killing your first bird, from the boat blind you built. I promise it will put a smile on your face all day long .