I am aware of cat2fold desing and actually thought it
would be the best solution for a folding big proa.
Trailering is not an issue for me. Accessing marinas
is. The scissor-like mechanism of cat2fold design
would probably offer most reliable and solid solution
to folding while afloat. To get reasonable beam while
folded steering wheels should be in the cockpit
(tillers would be better but I haven't been able to
figure out how to get 360 degrees rotation functional
with tillers). Rigid walkway and optional dingy ramp
would be hard to fit to folding option though. They
would be very nice but I haven't been able to figure
out those details yet. One monohull design had
removable walkway part of cockpit bottom that doubled
as gangplank. Perhaps removable/folding walkway and
dinghy ramp that can be lowered while folded. Two
gangplanks that can be attached between hulls as
walkway? Or perhaps just live without the added
complexity... Just remembered the KISS principle
again.

Arto