I would have changed the rust
I cursed all of the drain spouts the first time I saw them and the hidden rot they caused. Water should go around the car, not through it. I do think they designed the car to be self draining should someone decide to stick a fire hose in the sun roof. But the drains are the major reason for its rusting.
Made a light weight option. Hood, trunk lid would be aluminum skinned with stamped aluminum girders. The seat frames and rear subframe could also be aluminum, although the subframe would be cost prohibitive compared to steel.