b) the English Stealthmarine announced in 2004 the launch of a new A class cat fitted with a revolutionary canting rig; the result evidently came short of expectations since the info was cancelled from Stealthmarine's web site. I suspect that only the prototype was built.
Stealth have a set of A class Moulds. I don't know if a prototype was built or not.
I may be using them for my New boat when I get the finance in place.