Without the prisms, they make good substitutes for bricks. I'm willing to bet if you keep collecting them, you could build yourself a Nikon house which is both lighter and stronger than a brick one.
Or you could donate your least favorite F2 to someone who would use it quite frequently. Wink, wink...
When you ask "Why do I have six Noct Nikkors?" then there is a real problem. 😱
An interesting question might be what maximum weight would it be with all your cameras and a lens mounted on each.
Just some curious musings.
Happy shooting!
Phil Forrest