As I had written in an earlier post I pulled a skylight vent out of an 85
Westy.  I am getting ready to instal it in my 82.  Here is my question: Where
do I make the "incision"?  Do I cut the roof right at the inside of the
indent or do I leave a little edge?  I don't know if this makes any sense to
anyone but if it does I would love the help.
Thanks,
Coop