Its a nice looking setup but I would be concerned with having the posts in so shallow. A post that is 12-18" probably would not be deep enough to be left in all year long if that is what this setup calls for. I think that the ice flow would pop them out. Without the frame of the dock holding them in if the ice froze around them and shifted slightly they would come loose or bend. If you had to reset them every year it seems like a lot of work.
The NH DES rules as far as dock dimensions and canopies would probably cut down on some of the appeal. NH is pretty particular about specs, I can point you to the manual for it if you wish. They limit length, width and the size of canopies.
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