Fiberglass floor panels?, Recently bought a 914 and when I searched for rust on the floor I found fiberglass Options

[Mendivil26]

Hi, first time poster, since I just got my 75' 914-4 2.0 a month ago.
Car runs and drives, but is cosmetically ugly, it was originally copper, but one of the previous owners painted over the copper to make it look green, now the green paint is falling off.

ANYWAY!

My intention is to drive it around with spartan interiors, just the essentials, no carpets and barely any electronics to keep it simple and fewer things that can go wrong since my goal is reliability (yes, it's a daily driver).

So this past weekend I started gutting the interior and removing all the carpets, expecting to find metal panels that I would look closely at for rust damage and evaluate if I they were going to need to get replaced or repaired or what..

to my surprise, I did not find metal, I found what I believe is fiberglass or some type of cardboard panel covered in resin. It looks like one of the previous owners laid up fiberglass over the metal panels, either to protect them from rust, or to cover all the rust spots that were already there.



I tried searching for info on this already to no avail, looks like it's not common practice.
Has anyone else seen this done before? Should I be worried? what would you recommend as a path forward?