Need a draw bridge or lift gate motor for a section of my deck

[showme]

Hey, this is my first post on this forum, and I've got an oddball problem. My wife and I are rehabbing an old house, and we added a 12x30 deck on the back. There was originally a dormer over the basement door, which is 12' from the corner of the back of the structure. I built a 12'x12' section, left a 32" opening for the basement door, then another 12x16'4" section, who's end is enclosed by the family room addition to the house. I then built a hinged movable section between them, with two wooden braces which swing on bolts, and are cut on the bottoms to fit on to two stationary lag bolts to hold it up when I need in or out. Let me say that the basement is more for storage due to it's low head space and dampness. (Old house).
This section is liftable by anyone with decent strength, but we bought this house to sell, and there will be issues with anyone who is smaller, older or feeble. I'm looking for some sort of motor that I can connect to the bridge and either the foundation wall or a stationary section of the deck, and wire it to a switch that would raise or lower it. Does anyone have any sources of these kinds of motors or lifts, or any other ideas? I appreciate any and all input on this. Thanks!