*edit: now with wip cpu! in later posts
This in what I have been working on the whole time:
1) no unnessesary production (count accurate)
2) no unused machines
3) demand and autonomous crafting (Independent supply to labs and refueling)
4) maximum belt throughput
The main combinator principal is a closed loop which initiates machines to craft one item-type at a time.
primary supplys are ores, stone, coal, crude oil and water which must be present or on demand delivered to the factory.
secundary products like plates, liquids and solid fuel can be premanufactured to reduce production time of end-products
end products are sequentially produced in a furnace array, in a assembler array, in a chem. plant array.
Everything is connected to a circular belt which takes from storages and outputs and gives to storages and inputs
Basically: IT DOES EVERYTHING FOR ME!!!
As of now this only works with dry-recipes

That means no chemical plant array as pipes are undrainable if I pump liquids count accurate.
Also I have to manually setup all recipes if the factory wants to produce something.