What I found when I replaced the rotted wings on my camper is that it’s very easy to install the new filon without cutting it first at all.
At the most, just do a very rough, over sized cut to give you plenty of room to adjust the fit. Then, use a flush trimming laminate bit on your router to finish the job. Do this for both the outer perimeter and the door and window openings. I think if you try to make precise cuts prior to fastening the filon down, you won’t get everything to line up perfectly.
There are plunge-cut panel trimming router bits available that don’t even require you to drill a pilot hole first.
Plunge Cut Panel Trim BitIf the filon you’re installing goes all the way to the roofline, just line up one of the long edges with that, and trim the rest in place.
I just fixed the broken image links in this old topic about a week ago.
2001 Lance 1121 Rot Repair:):)
