I wouldnt buy/build a nomex boat. Foam cores are just as light and much less prone to print through and water absorbsion.

Take a look at Lars Guck's new A3, the inside of the starboard bow looks like a waffle, the pattern of the nomex printed through to the gel coat.

I've also seen nomex cored boats weep water.

Foam doesnt absorb water, and you dont get print through and during bonding or repair you dont have to be as precise.

The downside to foam is it doesnt lay in the mold as nicely as nomex.

Bill