N86BZ is the one in the picture I posted. Its based at KPOV. I instruct at a club that has a hangar next to this plane.There aren't any currently registered NH-1s in the FAA database that I can see, but there is a Nighthawk NH-2. It's listed as experimental with a turboshaft engine. It has 4 seats. It appears to be possibly the only one of its kind, and has the N number of N86BZ. Some pro photographer uploaded a picture of it to Flikr:
It's a really odd-looking little plane!
Wouldn't the boat on top hinder flght ops??
You have heard of ocean going aircraft carriers, this was an attempt to make a airborne yacht carrier...