Thanks for those pictures, that helps me a lot! Looks like my plan will be a little more difficult that I thought.
I never did the rear sill, even though it's still halfway solid, the rest of the body around it is rusting badly. The right wheel housing literally fell out, the floor crossmembers are about gone, there's nothing left of the right lower quarter/rocker area, and the left quarter is rusted up high enough that the tail light is falling out.
There's a '77 C10 parts Burb in Blackstone that I'll be picking up soon, it had GM quarters installed in the late 90's and the entire rear floor area is solid as can be. My plan was to cut along the floor, under the seat area and then cut across the C and D pillars... then install the whole thing as a unit into my '88 Burb. Looks like welding the pillars back together will be a little involved, but doable.
