Printable Catamaran in human size

I have designed a catamaran which is big enough to carry humans (two swimmer each swimmer has a volume of 60l so it should carry 120kg). You can just float down a river or make some unique extensions on it. Design it as a sailing catamaran (with mast and sail) or as a pedal-boat with a pedal drive (3D-printable gears, drive chain, …). Just imagine what you could make with it.

The printable parts are mainly for the swimmer. The swimmers are out of several 150mm high segments (Height should f