I cant see an electric design working... at least not from any butchured guns available... TM's AEP series uses the grip to house parts of the mech, I wouldnt want to try and straighten that out and make it work. Unless you get creative with a lathe and a mill and a horizontal GBB design of your own, I cant see you going any other option than the two I described above.
If you REALLY need it to be semi auto, my best advice would be to take the action from a gas bolt action sniper and rig up an electric cocking mechanism with either a servo or selenoide... but your really getting out of my area of expertise then.
What you essencially are asking is to have a P90 (V6?) Mechbox squeezed into a 2 inch pipe. An electric design isnt going to give you any kind of usable FPS. A gas design is about your only chance of having this shoot at a respectable FPS. Every gameable pistol design is essencially an L shape (sideways). That isnt going to work for you, if you try to make it fit your basically going to have to build everything yourself, in that case why not just design it all on its own. Trying to make an AEP work is going to be even harder. Either a grenade launcher design or a bolt action are about your only available resources (that I can think of) for this project, both are (without a significant amount of custom work) are single shot at best. Even the bolt action idea is stretching it as far as size goes...
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