Long distance human powered watercrafts are usually displacement boats.
Hull shape and hull weight are central design issues, since ill-designed hulls and heavy boats have a big cost in term of drag (drag is the hydrodynamic force that opposes to the movement of the boat, a function of speed), and therefore of performance.
Human powered boats' hulls are different form other kinds of hulls (say, sailboats), and it is not advisable to use, e.g. sail catamaran hulls for high performance pedal boats.
A detail from the technical assessment of the optimal hull design for the OpenCat.
Here you will soon find a collection of hulls for the Open Waterbike (thank you for your patience).
Our boat is better than mine.