I will never give any garantees without running all the numbers on such an additions in detail. Besides the original builders of these boats will undoubtably have something so say about this and warranty. But Having said that, if I were to add wings to my own boat (hypothetical situation) then I would probably not even bother doing to math on what my beams and hulls would take and only do the math on the design of the beams itself. If you catch my drift here.

Wouter