My boat was built in 1975 (nr 106)and I bought it in 1990. Some weak points I experienced were problems with the mast pile support (not supported on the keel but on a rib) an d leaks through the chainplates. Since the deck has a sandwich construction you have to be very careful when mounting additional fittings.
A few years ago I met a Norvegian KC in Porto Santo (Madeira islands) en route for a world trip. This boat just had the standard rigging.
I can send you some review copies and rigging docs but this requires an email address.