>>526670470
i would swap the copper wire lanes with output.
swap red belt for inputs, yellow belt for output.
leave the red circuits for red inserters. materials for blue inserters.
because in my design the central belt lane is now a copper wire input i would change the placement of the blue inserters to be one belt tile per inserter. when 2 inserters take items from the same one belt tile they tend to fight over the resources and the loser ends up stalling.

also keep in mind the ratios for production and consumption.
red circuits need 2 green circuits, 2 plastics and 4 copper wire.
that is 2 iron plates, 5 copper plates and 2 plastics in raw materials.
for assembler ratio you have to keep in mind the crafting time and crafting speed.
blue assembler has crafting speed of 0.75
chemical plant has crafting speed of 1

picrel is my early game module for equal ratios without any production, speed or inserter capacity modifiers:
>red belts for input
>yellow belts for output
>3 chemical plants for plastics (6 per second)
>4 blue assemblers for green circuits (6 per second)
>10 blue assemblers for copper wires (40 per second. 6 assemblers for green circuits, 4 for red circuits).
>24 blue assemblers for red circuits.