I don't know who invented the rough deck, but historically Ken Winner is a leading innovator having invented most other really useful things in windsurfing, aside from the kite things he has done recently which I would suggest we overlook:
Innovations:2002 Designed the North Toro kiteboarding kite.
2001 Designed the North Rhino kiteboarding kite. Set several trends in kite design: Dacron construction, tip battens, segmented construction.
1999 Co-designed the “Longhorn” carbon kite control bar, one of the most popular high-end bars on the market.
1999 Produced the first serious kiteboarding how-to video.
Late 1990s Designed the Mistral WindGlider with Dave Johnson.
1997 Designed, raced and promoted the first modern wide, short boards, precursors of the current Formula boards.
1995 Developed and patented the anti-ventilation skirt, a device that improves the speed of shortboards in light to moderate winds.
1990 Together with brother Karl Winner, developed an automated, computerized speed trap for windsurfers.
1986 With Larry Tuttle developed “pointer” fins, the first spinout-resistant, highly efficient racing fins. This basic design won the pro worlds in 1986 through 1989.
1985 With Larry Tuttle developed the Tuttle box, fin box of choice among racers.
1981 Built some of the first “sinker” wave boards and was first to sail them at Hookipa, the sport’s premier surf-sailing venue.[
note some, not the first- that is because Mark Paul did that....at least some say he did anyway..!]1981 Ken Winner developed the adjustable mast track.
1980 Co-authored a popular windsurfing how-to book.
1980 Developed the carving jibe, a maneuver currently used by all intermediate and advanced windsurfers.
1979 Developed the adjustable boom with Larry Stanley.
the craftsmanship shows the passion that went into the making of the boards in the early days. Love the colour design of the early custom boards 
