Whenever you hold a block and air place is enabled, it should show a transparent block, where the block will be placed. (A bit like litematica schematic blocks)
This involves some server/client mechanic (a new packet)

How would this need a new packet? the transparent block would be entirely client side

Might be able to use something like this
Could I do this?

How would this need a new packet? the transparent block would be entirely client side

Because the air place command is server side. There must be at least some communication to tell the client whether air place is enabled

How would this need a new packet? the transparent block would be entirely client side

Because the air place command is server side. There must be at least some communication to tell the client whether air place is enabled

We're not working on server compatibility atm so we won't have to add any packets for now