Yes, that is correct, from the top you have fiberglass, Luan, foam, Luan.
Your problem sounds a lot like ours, we could feel some soft spots in places and assumed the Luan was gone. As soon as the Luan was off, we could see the Luan and fiberglass were actually the strongest part of the roof, and that the soft spots were indicative of where the steel had rusted through.
We first thought we could bend new steel for the roof and weld it to the stringers along the sides, but further investigation showed there was no steel left to weld to. You could put your finger through the rust in most places.
Are you seeing rivets popping out on your caps or awnings, or cabinets sagging inside? Both are caused by the steel these items are attached to rusting out.
Hopefully yours is still repairable, good luck and let us know what you find!
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