Boat your looking at belongs to Douglas in Florida - he is a member here though has been quiet of late. It was built for him by one of the guys in Germany. Beautiful boat.
It is an MHZ Cayman hull I believe (they have a larger version called the No Mercy that is over 60" long). I dont believe any plans exist for this boat.
I have some build pics from a guy in Germany that will provide as much information as you are likely to find anywhere -
1758 Caymann Offshore - Boot
LĂ¤nge (length): 1180 mm (46.45 inch)
Breite (width): 345 mm (13.58 inch)