Junkman, me, and a few others have done this.
Here is my photo essay
Link
your can probably find a few others in the 'search' function, but you'll have to look back a year or more to get many of then.
Basic hydraulics is easy provided you don't have to worry about a lot of specifics like stress, etc, and you have a spare control such as for a remote or FEL.
I'm a fellow canuck I got my cylinder at princess auto (
www.princessauto.com). You may be able to get one locally, but for a deflector you need a fairly small diameter cylinder, and from the looks of your set up, it looks like a fork ended cylinder is what you want.
Measure the minimum and maximum, which give you the extended and contracted sizes of the cylinder. It is very important that the cylinder not keep pushing or pulling your chute because if it does the chute will be bent or destroyed in a heartbeat. So, I' suspect you want a 1"bore like princess auto's 1200071, but the specific depend on your chute. Not everybody has a MIG welder, or feels ok with the idea of cutting up a perfectly new $100 part, so if you can't find the exact cylinder, go undersized or keep looking.
You probably want small hoses (there are probably stores around you who make custom hoses). You'll need quick disconnects which match your tractor too (they are all different).
I had looked at an electric deflector system. I had designed up one with a lead screw (threaded rod) and a wiper or window motor, or maybe an old cordless drill (because of the clutch). It was going to be a lots of work, and I wasn't convinced it would survive the weather.
I am very, very happy with the function of my home built solution. If you want to 'back and forth' this, don't hesitate to send me a PM (private message)