I originally intended to build a working window for the front, but after considering that the small space would make it difficult to actually operate the window, I opted for faking the window instead. I cut a front following the cardboard template from the mock-up and then built the trim to fit. I will enclose acrylic sheet inside the window frame during final assembly. No sense in risking marring the acrylic as I continue to work. Even though the window doesn't operate, I did add the holes for the horse reins.