Is Design correct?

So I have a design consisting of potentiometers which are hooked up to a series of 6 (groups of 2 for a total of 3 groups) digit displays. The potentiometer values are fed into 8 bit shift registers which power the displays. It seems like I have a lot of wires but looking at it, I don't see any other way of doing it as the digit displays need to have each pin set. Can someone take a look and see if everything looks ok. I can understand if not. My goal is to increase the number of "modules" to create a doomsday switch to release software given the correct set of user inputs. Another module is also listed on my page showing the normal push button binary counter examples.



P.S. It seems really slow. Is this just the fact that its running in a simulator?  

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