Phil. Yes, you can bump your head. You learn, quickly that it is painful..and avoidable..
Like any boat it pitches and rolls, more than some, less than others. It does its designed job as a coastal cruiser well. I have the fixed fins on mine, and they help. It weighs only 18T, so not heavy for a 42-43 foot boat. Nordy 40 I would guess would be close to 30T. Followed a pair of trollers, north bound around Cape Caution, they both had poles stowed, and they were going from gunnel to gunnel. We were rolling but it was not uncomfortable.
As for the Pilot house. The seat adjusts fore and aft, and up and down. Seated steering and visibility is fine. My AP does the steering better than 90% of the time. Standing and steering at 6 ft, might not be to comfortable. You might wish you were 6 to 8 inches shorter. The seat when it is fully aft, does impede the crew, still passable though. When fwd it makes it tight on the person standing and steering. A trade off is having the seat 90 degrees. It all works. Hope this helps. Dan