I'm writing up a concept for a mod, but I'm not sure it's actually feasible to do it. It depends on how air blocks are represented.

 

Are air blocks an actual thing, or are they merely the absence of a block? Can I store data and perform operations on them?

Air blocks are in indeed a block, it's not just nothingness, it you break an air block and there's nothing there, the game crashes

Cooool. That's good, otherwise I'd have to throw out a couple days worth of planning, as well as a really neat idea.