Multihull hull construction - scantlings

Hello!
I am a naval architecture student and trying to design an offshore racing sailing trimaran for my study.
I need help with determining loads on construction. I have available ISO standards ( working version of 12215 from net) but missing values of pressure ratio monohull/multihull coefficients.
Is there some (other) classification society covering this area?

 

Hi there, me too a Naval Architecture student donig my project in catamaran ferry design, i was wondering if u got any design notes on catamaran design, u know hull design, midship section designs. Also do u know the criteria for planning craft(what froude no??)> Do u have any Autocad drawings of any catamaran hulls?? or G.A of any passenger Catamaran??