The "Product support" area has the templates.

http://www.hobiecat.com/support/images/tech/hulltemplate.jpg

6-8 layers of glass. Trim when green to save time in sanding. Once hard, use a grinder or rough file to take more off, saving lots of time, and then sand for smoothness. The shape is not that critical for recreational sailing.

There is one additional issue. If you wear to the point that the two sides are no longer attached, you should lay up a layer or two that connects the sides. You would grind some of the gell on the sides so the patch can wrap around the corner and attach to the side glass. Better to do the bottom job before it gets to that point. Would be leaking like a sieve.