Look behind the bumper mountings for any signs of collision damage. Check the condition of the bumpers themselves, rubber bumpers are expensive to replace and the supporting armatures are susceptible to rust. These panels tend to rust along the bottom seam where the lower part of the wing meets the top of the sill, because this area is often becomes a trap for dirt and moisture. Corrosion can also occur around the headlamp. There is a drain hole at the bottom of the lip on the front wing, if this is allowed to remain blocked, dirt and sludge can build up and corrode the panel.
Doors Check that the doors fit correctly with even gaps all round.
If the doors are a tight fit at the top and prone to stick at the top, then they are being pinched in by a folding body tub or the tub has been repaired unsupported. Examine door seals and make sure the window winders work smoothly. Check the drain holes and look for signs of corrosion along the door bottoms. Check this are very carefully. These panels are the most likely site of corrosion and when it strikes here they must be replaced because they provide vital structural support for the body.