Modular blue processing unit production, designed for main bus. My goal was to make it tileable, space efficient and wide enough (along main bus), so I won't end with narrow spikes across my bus. This design lacks balancers for green circuits, so you'll probably need to add them manually after each 2-3 tiles. Also, you can use speed modules, inserters mostly should handle it, because most demanding green circuits are supplied by fast inserters.