Metal floor added to fiberglass one in 1975

I have a 75 that I am about to pull the body on for full frame off.
Has anyone added a metal floor panel to reinforce the floor on one of these earlier C3s with fiberglass floor?
If so, what did you use?
I did the customary search for this but found nothing.
Txs for any help or suggestions.

Dennis

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Metal floor added to fiberglass one in 1975