<<A 28' folding trimaran that can sleep 5 adults>>

  It does.  A good use of space.

  The challenge with the proa is twofold:

    - Balancing fore-aft weight with flotation.  The tri can widen out the stern to take the weight of the cockpit and aft cabin.

    - Folding width.  The tri's floats don't have masts, so they can tuck in down by the side decks and make traiiering width, even with a swing-wing like the Dragonfly.  The proa is going to need some soft of above-deck cockpit, which might challenge the folding width if you want an overhang to windward and a semi-full-height leeward hull.

  I think the Ex40 solves all the problems.  I'm just not sure you can go much smaller and still sleep all those adults along with a head and galley.

        - Mike

 

from the web site dragonfly 28 underline is mine:

"A 28' folding trimaran that can sleep 5 adults, offering an aft cabin, queen size V-berth and two easily set-up foldable berths in the main cabin. All bunks are 2 m+ long. The boat has a standing headroom of 1.85 m in the main cabin as well as a generous galley space on each side."