So it would appear that they actually rake the mast forward/back whilst sailing to trim the boat? - a bit like a windsurfer then?

Cool looking vessel, exactly the sort of challenge I'd relish <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" /> although I guess I'd be one of those 'poorer guys' <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />

Yes, thanks for the pics George.