Looks great!

I was thinking of a method to use substations and four miners facing each other, but it's hard to get a good setup. Sorry, but I don't think that would work. I was experimenting with 4-miner units, and I made something like this: https://steamuserimages-a.akamaihd.net/ugc/859486570395931936/EE17FF4...

See, what the devs should do is make it so that inserters pick up a full hand of items first, bring it over to the machine, and then decide whether to deposit the items or not. That way, the items are immediately available once the machine goes below <2x the amount of items required, and while it us...