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.
Honda NSX NA2 1999
The only absolute knowledge attainable by man is that life is meaningless without an NSX