Look at Mickeytee's picture. Above the frame is mostly fiberglass, I didn't have to cut into the frame and I never said you could pull the tanks out. I was working on an EGR line to the canister and I only thought pulling the tanks was possible, but was not sure. And redvett94 dinging me for my comments is cowardly without giving any reason; I will return the favor.
The C6 body is not exactly the same as the XLR, though you may be able to remove the tanks without removing the drive train. That would be great.
If I recall I was mentionng ''fuel tanks '', on how you did it for the EGR hose and it would be great to make a thread for the members.
You mentionned to a member it could be possible to reach the fuel pump with an opening in the rear trunk tub made of fiberglass, I found it could be interesting to tell us how you did in replacing an EGR hose, from the tank #2, in order perhaps for been able to do it for a the fuel pump,
It is obviously impossible to remove the tank from a such small opening, as underneed of the fiberglass tub, are metal components.from the metal body of the car interior..
Correct the c6 is an improved frame, from the c5, and both are of the same design.
Correct it is possible to remove the tank without removing the rear end, I have seen somes video were c6 owners did it.