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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.

https://www.tinkercad.com/things/j6qkjPiGf1V-digital-combination-sim

 

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

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