Am I missing something? Is this theoretically the smallest or close to smallest possible self-contained Kovarex system? Perhaps if the machines directly insert into the next? I shouldn't need to connect wires to any other box or machine in the next segment, so it should tile up infinitely.

The idea is that the inserters will only shuffle U-235 and 238 to the next segment's boxes if that segment's box + machine has more than a certain amount, all excess then leaves the system at the end. A simple gated compression supply system. I'm kicking myself for even using a loop of belts before just because that's what I've seen done by others.