It’s time to install the windows so the first thing to do was get a line from back window to front window along the bottom so the windows look to be in line when done. I cut this line by had first and started 6” in from each end. The door was flipped and then radius the corners and connected the lines. I cut where the door skin and stiffener meet. The dermal came in handy to cut the corners and a ¼ round file did the rest.