Last floor to do is Manufacturers for the final product. And, you know what? Screw it, we're doing another sushi belt!
Again, a Mk.4 belt is the upper limit, and that's more than enough to handle the 3 inputs we need, 2 of which are low-volume. Two mergers to get the three products onto the belt, and a Smart Splitter to handle any overflow, in an emergency, like before. ALSO, since this is the end-of-the-line, I turned the whole thing into a loop. So, any resources that don't make it into one of the machines, just loop back and try again, unless there's an actual backup.
I actually was going to use 2 Priority Mergers here, at one point, such that they would prioritize using resources already on the loop, before adding more on, but I realized that would be counter-productive. It would mean that the loop NEVER stops flowing, so the emergency overflow splitter would never trigger, in the event that the loop gets flooded with too much of one type of resource.
Maybe someday I'll have a legit use-case for a Priority Merger again. I'm had one in the playthrough I was doing with my wife, before they existed.
Some belting to connect everything up, an elevator to move between floors, an an AWESOME Sink to handle overflows. Also, I just realized, from the screenshot, that I need to split off a portion of the main product for uploading, before sending it to the Sink.
Only 2 more things to do before we can power on for a minimum-viable factory.