I plan on getting the D20 motor as soon as DH turns my old door into a sliding door. We will probably use a plexiglass (heavy grade) or aluminum door. I would like to have metal runners for it to slide in, as my sliding door with wood sides on my bantam coop, tends to hang up in wet weather. DH is very good at building stuff, but I would like to know what type of ready made metal pieces have you used for the door to slide in. I would like to have the door on the inside and have it slide below the opening and be as tight to the hole as possible. Let me know what you all have used, Thanks.