I'm not sure if this is the correct area in the forum but it seems right to me.
4 years back, while living in Greece (I'm now in Australia) I decided to create a lift so the projector would be hidden when not in operation and could fit into the space nicely.
The box was created from 4mm plywood which kept it quite light.
The idea was that the projector would sit on the bottom of the box as if it was on a shelf
The motor was taken from a scrap yard and if I recall I paid about 5 euros for it.
It's from the windreen wipers of a Fiat Punto. These little motors are very robust, strong and can move either clockwise or anti-clockwise depending on the current you feed them.
The way it worked was that the top rod would rotate, allowing the wire to be wraped and unwraped resulting in the bottom part of the box to move up and down.
Two "stop switches" were installed which were set to turn off the motor when reached a specific position when going down or lifting up.
The rails were from heavy duty shelving racks with bearing.
Overall it cost me around 60 euros which was pretty great considering the ready solutions.
One thing I never got round to doing was changing the manual switch with an RF remote.
The end result was this:
The wife was happy so the goal was accomplished