Coming soon to a factory near you: New game to Rocket Launch challenge run using only one assembler and an entirely unholy amalgamation of circuits.
It would not take much in the way of circuits, actually. Some constant combinators can hold a list of recipes, and then a circuit that goes through the list one at a time takes like 5 combinators. With a human adjusting things once in a while, that's about all you need. Even upgrading the circuits to make specific quantities wouldn't require much. The unholy amalgamations would show up when you're trying to make spec…
One assembler, no chests, only sushi belts. Let’s go.