That's actually a pretty good approach for a simpler loop controller I think, though I would point out that my main goal for my design was to centralize the controller so that I didn't have to run circuitry throughout the actual loop with the factories.

I dont really know what happens if there are ...

AKA I found another use for the starting pistol after it becomes obsolete by making the submachine gun.

http://i.imgur.com/k9bJiXf.png

So I don't know if anyone's done anything similar to this but after doing a reasonable search I didn't find anything. The nice thing about Assembly Loops is that ...