hello sir,
interesting idea,
i can design this project for you, with a prototype of the electronic board with micro-controller, the keypad, and the motor, and maybe the mechanism, but the mechanism will be already designed and simulated by soliworks
for the electronics work will be using Proteus software,
That's my skype "gaber2611", if you need we discuss this project there, as im not always here
hope we do business, together, as we're Arabs :), and wish you good luck with this project
regards