Like a lot of things in life there is more than one school of thought. It's always possible for folks to have two completely different experiences given similar circumstances.

WRT to the chassis film, I wanted to be able to test different weights as well as placement of those weights. This required me to cut holes screw holes in my chassis film. In addition, I cracked the rear chassis plate which required cutting a few more screw holes in the chassis film.

I view the film a consumable item and if it tore, I would spend the $9 on a new one. My local track is hard packed clay with a few rocks here and there. I personally consider a tear at the screw hole lower probablility than a tear on the leading or side edges. After all when removing the film on servo tape I attack the edge not the middle.

Anyway, I know some folks have had a bad experience with cutting holes in their film but I haven't. As you can see by the picture, the film has done a remarkable job protecting the chassis. If it eventually tears, then I will spend the $9 and replace it (actually already have a spare just in case).

I'm not discounting the experience of others, just presenting a different experience.