The flying mouse is a design that should be an easy and quick build. The designer has the following to say about it:
Flying Mouse is an exercise to develop just about the smallest, cheapest possible sailing boat I can conceive. As a result, it’s not a boat to which you can safely trust your life in any sort of waves – as anyone who climbs into a Flying Mouse will quickly realise. Nevertheless, and I think it is capable of providing hours of summer fun in a strictly supervised environment, which isn’t bad for a boat this cheap to build.
So, buy some 1/4in plywood and enjoy your weekend!