Great idea!
My cat is opened manually (no lifts), and has a wing, so one of these day's I'm gonna pull a muscle.
Found these guys who sell actuators that range from 4" lift up to 40" lift, and up to 400lbs of force...
http://www.firgelliauto.com/product_info.php?cPath=77&products_id=55
You can select based on force, stroke, speed...
The actuators aren't that pricey (well, that's a relative comment and depends on the factors above), but it probably starts to add up when you buy the electrics (switches, wires, relays, remote?) and then your time to mess with it.
At the end of the day, you're probably looking at $300-$500 depending on how you execute.
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