This is nothing I''m currently building, just a thought I''ve been mulling over.
Out-rigger canoes have the long side poles attached to either one or two "floats" to add stability.
Could one build a sailboat using similar design features? (though, really I''m thinking of shorter, more rubust "wings")
I would think this would add alot to the stability, and other than being a little unwieldy, I don''t see too many downsides unless it''d be a structural stress issue.