Compact 1x1 loader requiring power.
Mods introducing new content into the game.
Augmented or new ways of transporting materials - belts, inserters, pipes!
Entities which interact with the circuit network.
I'd suggest using the graphics from this library, as he offers it to other mods as just a graphics package if wanted.
https://mods.factorio.com/mod/aai-loaders
I will add that functionality as soon as done with the migration from miniloader code.