I finally got started on my 13' Sea Bee from Yost's site. I made posterboard templates of the ribs. I noticed that even the largest rib seems very small, especially the opening on the inside. I am worried that my 200lb 5'11" frame will not fit in the boat. Being that I have never been in a kayak I don't know how tight I should expect it to be. Are there a standard set of dimentions for the inside of a kayak to make sure I will fit? Has anyone else had any problems with the size of the Sea Bee?