Surely windward hull length could be compared directly with a trimaran. The F27 fits in a tight double forward, a small double aft (center cockpit), a rudimentary heads, a rudimentary galley and a saloon convertible to 2 singles or a double. The wide stern helps the aft double but the cockpit takes out some of the usable length.

A proa with similar accommodation does not need to be any longer in its windward hull. The Farriers have wider main hulls in the water than the proa windward hull but that is a choice not a requirement. The layouts being discussed appear to me to be aiming for better accommodation than the F27 especially with regard to the heads, the galley and the double berth width.

The leeward hull is going to be longer but the folding bows might mitigate that for trailering.

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