David,
Aquarius Sails builds production boats as advertised and shown on their website. Aquarius will also build whatever size boat you want as long as it can be built with production tooling. In response to questions about a 20ft ARC boat from sailors considering a distance racing circuit, I pointed out to them the capability built into the original 22 tooling. A 20ft boat can be built in the ARC22 mold by simply placing the transon immediately after the rear beam. This boat is a true 20ft ocean racing catamaran with the mast 1ft aft of half hull length and the tall eliptical hull forward for sailing in big waves. This forward hull shape allows for the maximum forward migration of the instantaneous center of bouyancy and the rear beam being on the transom allows the crew to move further aft freely; no rear beam and tillers in the way. This maximises the distance betweem the CB and CG for maximum pitchpole resistance. This increase in forward stability leads to more reaching speed and downwind speed with the spinnaker especially in big waves.
Bill