im not sure that i would want a window sticker. Maybe a body decal. I want to individualise my car with something that can be removed if necessary. A ref to NSXCB seems appropriate as it covers all members without singling out a particular model. I had thought the decal could be adhered to the engine cover projecting onto the rear window. Perhaps something good to go on a roof or rear wing.
As for what the decal should portray... I like Prides suggestion using the profile of the NSX. Maybe colour coded to match your own NSX.