Here is a Google album of Matt Johnson updating his V16R2AK pedal-boat in the lead up to the 2018 Race to Alaska (R2AK). Matt was able to lighten Rouleur by ~20 kg (60 pounds) by removing the wooden decks and amas and replacing them with a lighter material — divinycell foam sheets strengthened by fiberglass — and by fabricating new, lighter beams from a foam core and laminated cedar bottoms/tops. He also added a suite of features to make pedaling 18-hours per day more comfortable, including a sea-kayaking rudder, wave shedder, and a new cockpit cover — including a spray skirt and sun/rain bimini.