Bigkat it's apparent that you have put a lot of thought into your layout and that you want a multi-purpose boat. I would suggest that you mock up the floor plan using cardboard and then get you and your wife in the boat and and move around a bit and see how it fits you. Boats always seem bigger out of the water and you have incorporated a lot of features into a modest sized hull. It's all personal taste and may work out for you just fine.
Good luck with your build, I'm looking forward to see how it turns out.