Ok so I have been searching in the forums and I'm having trouble finding anyone who has had experience with cutting a hole in their abs roof for a vent fan. My 2000 Coleman Cheyenne has one roof brace and the 4 dots for the recommended corners of where to cut into the ceiling. My roof no longer has the original plastic, but is now covered in a grizzly grip liner. I'm trying to figure out if this is a terrible idea to try to cut this hole and what would be the best way to go about it. I'm wanting to order a maxxair fan 5100k. does anyone have any links or thoughts to put into this? thank you so much for your time.