Motorized projector lift (scissor lift?)

Does anyone know where to find some DIY plans for a motorized projector lift?

I am looking to build a remote controlled lift for a small DLP projector, dropping about 10-18inches into the room.

I don't know where to get plans, but scissors jacks like that are commonly used in chemistry labs, so readily available. They are operated by turning a screw. It shouldn't be hard to attach a stepper motor to one and program a uC to control it. A stop switch at each the end of the range would tell the motor drive when to stop the motor and which direction to run it in when it starts again.

Sounds like a fun project.