Airsoft AK-47 bolt modding platform

i mostly made this just to get rid of the battery tray (because i hate having to deal with that stupid screw on the hopup)
but however due to it's flat and spacious design this has opened up a few options for other possible modifications, Eg:

mechanical blow back:
cut a slot in the top of the gearbox and connect a rod/cord going from the piston to the bolt.

electromagnet blow back:
setup a micro switch in the gas block that will send a short burst of power to a electromagnetic piston/linear motor causing the bolt to be pushed back when both the micro switch and trigger are activated.

bigger bolt spring:
pretty much just make a knockoff ICS style bolt.