I've made two sets, the first was for our 02 Sunnybrook and the second for our Bighorn, the Bighorn was the easiest but that could be because of prior experience. Installing in the door was easy because of the slots that the Plexi could fit in. I leave them in the door year round but I know if we wanted to remove them we could since I left the screens in. It was my first mod to the trailer.
Trust me - if I can do this any of you can. It just takes a little patience, I used a hand held jig saw for the curved part and a Plexi cutter that you can by that is cheap. Traced everything out with a magic marker and went to town.