Really Clean, really good

Well built and looks nice, but you should make it more intuitive or guided for inexperienced players. A: The input and output are not labeled for new players. Easy for inexperienced player to use wrong input. B: The input and output clip the frame a bit. This is minor and cosmetic, but might lead players to think they shouldn't use them. C: Build description says two buss, but they are hidden and inexperienced players will not find them.

how do you connect all the conveyers

I like the overall setup. I would recommend maybe putting in a 1 meter foundation so you can put in a conveyer lift hole. Then replace the foundation with the catwalk like you have it. It gives it cleaner look and avoids that clipping look on the lower level.