This is a plastic bar blueprint i made for late game which is also scalable between 11.300 per/min, 22.600 per/min and 45.200 plastic per/min or 4+, 8+ and 16+ blue belts of plastic. I tried to make it aesthetically pleasing as well and it takes a somewhat rhombus shape when it is fully deployed. Hope you like it, below is a blueprint:
https://factorioprints.com/view/-MYUYIYUcJMgwOr42cGW