Hey gto2,
Have a look at the website - www.2hulls.com and check the beam to length ratios from the "brochures" of the various cats available. Follow links : Resources - then Gallery.
Ours is a Nautitech 475 & has B/L of 52% and is ocean going. Most of the French Cats are delivered across "the pond" on their own bottoms.
Cheers
Jinga