replacing trunk floor pan

[Rockyrocco]

should you replace the whole thing or just cut out the rust and replace the bad spots.

[dpixel]

I would think it would depend on how nice you would want the car.  It should be solid though due to the unibody contruction.  I had half a trunk welded in due to being hit from behind.  Also keep in mind that the inner fenders are attached to the trunk floor and those could be just as bad.