Man, I've been drooling over your kayaks since you posted your first one a few years ago.  I think I've told you this before, but one day I am going to make one... just need to find the space and time.  That thing is a vision of beauty, I'm always envious when you post those pictures 

Can I ask what the advantage is to doing the seam in the middle, vs. along one of the gunwales?  If I remember right, in Cunningham's book he mentioned stitching along the side?
Did you have a mortice machine for all those joints?  I need to find a cheap one somewhere, I can't imagine drilling and chiselling 50-some mortices...