First up was the furnaces. I killed the old inline furnace and designed a little modular framework. I used Green inserters as the furnace output set to Iron Plate < 20k. Active Provider Chests were used on the outputs. I found that the bots actually liked to move the plate to storage chests closer to where it was needed rather than the chests I planned nearby. This actually worked out VERY well. The Requester chests asked for 100 ore which seemed a nice balance between not running empty and not over stuffing.
Here is my whole Iron Furnace
I have a smaller one of these making steel, and a 50+ furnace running copper. Essentially all setup the same way.
I found that feeding 30 some odd active chests worked better with more Passive Provider chests so my Ore Belts dumped into this little system close by. I learned quickly that the queuing of bots to pickup and deliver was directly impacted by the number of (read lack of) passive chests they could choose from.
Notice this is 6 inserters per side on blue belt. This does a fair job of emptying two compressed blue belts into chests and fits the footprint of one sub-station.
For reference here is the rest of my base. I know...the ratios are all botched. I am also still moving things around. You can see near the top I've gotten much neater and bot friendly. Incidentally My Storage Chests are located in 3 areas. Above my Iron Furnace, Above my Copper Furnace, And a larger set around the small pond in the middle of my base.
Biters are on and bases are BIG so i have lots of eco friendly power. LOTS of Solar
Hope you enjoy!