I am not talking about hypotheticals or museums, I am talking about actual running systems. I know the most active restorer of Symbolics systems in the US. His

I am not talking about hypotheticals or museums, I am talking about actual running systems. I know the most active restorer of Symbolics systems in the US. His biggest problem is finding enough consoles and keyboards. Why don't you try to actually build a reproduction Symbolics keyboard (I did), and see how much time and money it is going to cost you.