Yes, you should have some overlap from the deck to the hull.  This helps with strength and with durability against the inevitable abuse the edges will take.  

The deck to hull seam takes a lot of stress, so it's important to glass it. Here's the neatest way to do it: Cut strips of glass cloth about two or three inches wide on the bias - that is, at 45 degrees to the threads. Apply masking tape the full length on both deck and hull about an inch from the seam. Epoxy the cloth strips to the seam. After about four hours, while the epoxy is still soft, use a utility knife with a fresh blade to score the cloth along the edge of the masking tape. Then pull off the tape and the edges of the cloth will come with it, leaving a clean edge that can be sanded smooth after the epoxy hardens for a day. -Wes

That's a hot technique, I will do that today.  I have a good amount of leftover glass cloth I can use for that.  I can think of other places that technique would be useful, too.  Thanks.

You can see photos of this technique before and after stripping the tape on my Ganymede page at http://twofootartist.com/ganymede-construction-notes/ Scroll about 2/3 of the way to the April 16, 2010 post. -Wes

Oops! That's the May 16 post. Left click on the photos to enlarge them to full screen. -Wes