Yeah - Sparky said it right. Build it to the specs and bring it. Rules and measurements can be found at
http://www.naf18.com in the downloads section. For one brief initial moment the NAF18 boat specs deviated from the International F18 rules but no more. Only the rules regarding sail verification and boat verification (i.e. WHO does the measurement verification) are slightly modified in the NAF18 class. All weights and dimensions are the same and open to any manufacturer.
I think the Blade is a damn sexy boat and would scale well to the F18 spec (although they would have to ADD some weight) - wave piercer bow but with adequate volume up front to handle a blow. I was very impressed with it at Tradewinds having sailed along side it once and having it show a slight upwind advantage over us on my F18.