6 pilot pirate ship.
2 front wheels driven, one steared aft.
3 pilots drive each front wheel.
seating:
  2 recumbent front, serve as breakmen
  2 recombent middle
  2 upright rear, either can steer.
trussed framework.
  4 trusses lengthwise in crosslinked pairs, front wheel and drive belts for same inside each pair.
  4 trusses divide space into 3 bays front to rear.
  triangle 'truss' on aft 2-3 cross trusses mounts aft wheel.
total size for main framework, 10 ft long x 6 ft wide.

foreach front wheel, 2 conventional bike chain runs to aft axle, one to fore axle.  belt from pully on one axle, over top
of wheel, round pully on other axle, under bottom of wheel, back to first pully.

flotation units attatch removably around frame.  mostly nose and tail.

6 cubic feet = 360 lbs convienent under recumbent seats.
20 cubic feet = 1200 lbs in between side trusses in space not used by
wheels/drive.
15 cubic feet = 900 lbs open below around wheel and drive.