Hi Martin,
The designer is Angelo Lavranos, a South African Naval Architect now operating in New Zealand. He is still commissioned by many South African boatyards to design yachts and powercraft which are exported all over the world.
Here`s a link to his web-site and the boat you are looking at in a bit more detail, if you have any questions you should contact Angelo directly.

http://www.lavranosyachtdesign.co.nz/sc_10m-multi.htm

Cheers
Steve