I have started work on splitting up parts of the Sushi Train into smaller factories. The thing I liked about the Sushi Train was that if one of the assemblers/manufacturers/etc weren't producing anything anymore, then another could use the same building resource instead. That way you don't end up wasting ingot/ore production because the assemblers are idle. As an example, I have moved copper sheet, ingot and wire construction (mostly) next to the miner and each of the 3 can use 100% of the miners output. That way resources are only wasted if both constructors are idle and no ingots are needed elsewhere.