think it's widest size that usa law regulates for normal load on normal trailer
you can build what you want but if it's not trailerable people won't buy them
where the laws are different cats are built either wider or narrower
someone said that australian nacras were of a different beam from usa built boats
apparently 1:2 proportion is a good size for cats if trailers aren't an issue, so my 17 foot nacra 5.2 could be 8.5 feet wide instead of it's current 8foot? width
eric e