My stages are:

• Slow, inefficient and spaghetti factory but gets the job done, everything stuffed in a few boxes.
• get output parts split randomly along belts to make the more complicated products
• make a train, yay!
• run out of power, aww…
• bring out the spreadsheet, careful clocking and splitters to make “ideal” ratios of products to perfectly utilize maximum ore production
• Get a healthy supply of smart splitters, use overflow and stop caring about perfect ratios.
• retrieve products from “perfect” factories in spaghettified manner again to get the highest tier materials
• remake the base with better ratios and better aesthetics.
• sit back and realize you’ve spent 100 hours of your life on this, couldn’t be happier.