The main issue is on the passenger side. Sorry for the error.
But the buckling fiberglass in front of the water heater in the picture from the driver's side tells the same story.
Look at the picture BurbMan posted. Once you start disassembly, you will be surprised. And not in a good way.
The cabover is already coming down on the roof, if I understand your initial post right. You will need to support it when you drive this thing. Putting some sort of buffer between the roof and the cabover is probably the only way to do that. And even then you need to drive very carefully. When this camper starts porpoising, every cycle is going to make things worse.
Those brackets fastened to the lower edge of the cabover on the driver's side... I can only guess they are there to keep the floor in.
That does not look good :-(