Much of the challenge in this is mechanical and for that you need to be clever with the materials and tools that are available. As for the electrical part that is used to trigger the doors to open, you should keep it simple and easy to understand to start with. Later on, when everything is working, upgrades to more sophistication are possible. But in the meantime, consider using simple electrical parts including 12V power supply from an automotive battery, 12V relays for control and perhaps a solenoid or trunk release from a car to actually release the doors. Run a pair of wires from the control location to the trap door assembly, don't consider fancy wireless controls at this point. By scrounging car electrical parts you will automatically get items that are designed to operate with 12Volts, which is handy. Perhaps a visit to the auto wrecker to dig up an electrical trunk release mechanism?