Hi!
I'm really enjoying this mod. I've been diving into a bunch of different uses for it, and I'm currently trying to implement your description of a universal station.
Connect the output to a filter inserter, keep a count of how many items have been loaded into the wagon with a memory cell, and use an unloading inserter to remove any items that exceed the requested load amount. If done correctly you have built a universal item loader for this cargo wagon. Build one of these units for each cargo wagon along the station and you have created what I call a universal station
Specifically the memory cell implementation. When providing and requesting multiple item types, I can't seem to come up with a design that uses a single memory cell. I would need a memory cell per-item unless I'm missing something. It's very likely that I'm missing something.
Do you have a test or demo map with your station designs, perhaps?
Thanks!
MsNostromo
she/her