It seems that they are indeed pioneering new technology, a mix of solar + sails + electric propulsion, including power regen from underwater propellers. It will

It seems that they are indeed pioneering new technology, a mix of solar + sails + electric propulsion, including power regen from underwater propellers. It will have "one of the largest marine electric engines in the world". The wood framing is likely just the most accessible way to build a technology demonstration model.