My advice would be to double check particulars of the design or the design as a whole with others.

People I'm thinking of are Phill Brander etc, using private channels.

In small boat building there is something to be said for having already build and prototypes a few versions of the design. This to avoid some rookie mistakes. One of those rookie mistakes is to use a foam core that is too light, but promises a boat that comes out a minimum weight. And believe me even large professional boat builders have made this mistake.

Also in the way of small beach cats, the right volume distribution can be critical, same with rearbeam clearance of the water etc. So be sure to check the specs against some other succesful designs. Basically double check everything.

Home building a beach cat is a time consuming and expensive project. It is probably only marginally cheaper the actually buying a commericially sold beachcat. You don't want to end up with a dud, especially not if you want it to be a formula boat like the A's, F18's or F16's. Because if it isn't up to spec in relation to others then you can forget selling it on against a reasonable price and recouperate your costs. This is one reason why a designer will be very accomodating when somebody else does the prototyping. I know as I have the same problems with the F12 design and I give the same advice to people willing to help me in that project.

Better save then sorry.

Wouter