Need some advice...

[Wall]

I had plans of patching my wheelhouses on my 67 firebird this weekend but the more I cut the more rust I found. The worst is around where the inners mount to the trunk pan and the shock towers are toast also. Someone really did a job on the trunk pan trying to hide the rust, I found thick bondo on the trunk pan around the shock mounts and fiberglass in the center trunk floor.

So now I'm thinking I need to replace the full trunk pan, inner and outer wheelhouses, and both quarters. Can I install the full trunk pan when one quarter and the wheelhouses on that side are out? What bracing should be done if this is possible? Right now the car is resting on jack stands at the fronts of the rear frame rails with all rear suspension and gas tank removed. Also should I try to save any of the inner wheelhouses by cutting patches from the new ones or just replace them entirely?