This is a prototype build with TMI in my test world.
RedPower-based wiring and lights are used. Two buttons both are switching elevator (and its lighting) on and off.
Elevator shaft
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It's quite pointless to have an on/off switch, since it only drains power when used anyway...
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I expect up/down control or energy drain control before I start bo build this, but currently the only real purpose of switches is decorative lights control. Even after a power to be switched off there is enough power in Magnetizer to allow travelling 1-3 times.