As above. YDNA would be the chappy to help.
It all is quite simple though. Buy a 'noid, shove it in the body, put the board in the grip frame, wire both up, put the bolt in the body, screw body to grip frame and shove on a barrel.
Well... Kinda. But you get the idea from that. Not many parts make up a Shocker.
Good luck though mate.
Russ.