Just a quick question... why didn't you just buy a motorized screen to begin with? Only a couple bucks more, and this is already built in. You could probably even sell your current screen on here, and take a little hit, but buy the new one.
Looks like this for $250 USD
Closed:
<img src = "
/front%20inner.jpg)
", width ="800", height = "600">
Open:
<img src = "
/side%201%20final.jpg)
, width ="800", height = "600">