Modular factories help

Hey!

I've just started a new world and plan on focusing more on building instead of just rushing factories. I want a world that is efficient but also nice to look at.

I was stuck between a main/mega factory/base or modular factories and i felt like modular factories were the way to go. They look nicer. More opportunities, and more build experimental opportunities aswell as it's easier on my pc. I just don't know how i would go along with it.

I don't know if i should have a factory for specific parts like motors, smart platings, etc and just train them off to other factories that need them or just make all the items needed in that factory.

I was planning on doing multiple items, like iron plates, screws and rods, maybe reinforced iron plates etc in singluar factories, and then again, using trains to take them to places but wouldn't it just be easier to make the plates/other materials in the factories that need them??

Sorry if this is confusing.