Brother, I am no means an expert....however I did my homework on this matter when planning our new coop. If ya gonna be into this addictive hobby, calling, "getting green" movement or as I see it, relaxation work......ya need to do the motorized door. This is just my opinion, but as much as I love messing with the girls and spending time with them....come 6am or so and they wanna get out, our door will open. Have been goingout every morning to let them out and again at night to lock them in...just like many folks do. hey, that's cool. I just saw an opportunity to make it all alittle easier with the motor and jumped on it. Can't wait for ours to come in and hook it up.
I made a simple track from 1"x"3's installed into the rough opening I left when doing the hen house framing. Approx. 14" wide and 16" high. Made the door out of an old aluminum street sign had laying around in my shop(twice the height of the opening) and slid it in place. Now all I need is my UPS guy to show up. Will let ya know how it works, but have seen others in action and feel confident It will work fine. Plan on plugging it into a cheap time and Whammo!...we're in business. check out my web page for photos of my door installed. good luck with your decision and coop design.
Erik