I am in the process of building a permanent coop for my ladies and would like your input on Automatic Coop Doors. I like the idea of setting the door to open and close at dusk and dawn. I travel for work...or at least I used to travel for work....and like the idea of the door opening/closing if I am not home right away. What considerations should be factored in...Guillotine vs hinge style...programmable...??? Appreciate your help.