You're not age verified Gattobuono so you can't access the classifieds until doing so.
Back on topic:
I picked up a Lonex V3 Shell for an amazing deal (I would have gone to airsoftstore.ca otherwise) and it looks to fit in a CYMA AK with slight modification - removing the wiring guide at the ass end of the box which prevents it from sitting in place of the CYMA AK receiver.
CYMA's motor cage DOES NOT fit the Lonex gearbox without modification as well (simple sanding, but I have no idea if pinion to bevel aligns) hence ordering a Lonex cage from airsoftstore.ca came into play.
SHS 2013 Edition 18:1 Gearset w/10 tooth bevel gear fits really tight into the Lonex 8mm ball bearing bushings, I actually have to wiggle them out (not sure if this is entirely a good thing, especially when removing the top half of the shell and your entire gearset is still attached

)
My concerns are with the cut off lever - I dont quite understand it (and I assume it breaks the electrical connection when in semi thus resulting in a single shot?) other than knowing it has to be there

Should cut off levers match with your sector gear brand? In this case I have SHS and just ordered an SHS v3 cut off lever - does the selector plate come into play at all? I plan to use my CYMA brand since it was made for that receiver.
I only ask because I recently had a SHS cut off lever in my Lonex v2 which didn't fire properly which Stealth rectified by putting in a Lonex V2 brand cut off lever with Lonex brand gears.