Boler Floor Repair

[Seattle Boler]

I just pulled out the laminate floor that the previous owner had put in my '73 Boler and found several issues.
1. The flooring had been shimmed using small pieces of plywood to level it out.
2. There is fiberglass with what appears to be gel coat over the plywood subfloor that has a hole in it.
3. The floor is really soft and spongy.

I am wondering if I should cut out the fiberglass top layer, replace the plywood underneath and coat with new fiberglass top and bottom? Or as another option put the original fiberglass layer back down and fix the hole that is in it.

An help would be greatly appreciated.

[ATTACH][/ATTACH]

[artichoke]

I took the entire floor out of my 72, was really easy and I think worth it, use it to make a new template with treated plywood, and after installing it cover with vinyl planking

[Seattle Boler]

So you took out the fiberglass and the plywood underneath?

[artichoke]

In mine after removing the original ugly yellow lino flooring the plywood was riveted to the frame , ground off the rivets, lifted out the plywood. cut new flooring and replaced it