As to all Carbon boats, what do you think an all carbon super fandango boat would weigh ? Having built a hand built carbon F16 my guess would be around 85 kilos in single handed mode, now the maximum you could save in the hulls alone would be about 5 kilos per hull over all glass hulls. Get where I'm going, it would have to be ballasted up to 104 kilos so you may as well make the hulls all in glass and save the cost. Carbon beams are not going to save you any weight over ali ( well maybe a minimum ) which really leaves the mast ( and they are not that expensive after all Stealth supplies them standard )and rudders and the likes.

Sorry Carbon construction is not the issue here as most manufacturers by choice can get down around class weights if they want to using Glass construction.