have you PULLED the battery and the tray and VERIFIED there is no rust?
have you crawled under the car, and looked at all the pinch welds for signs of bulging, or bubbling undercoating?
NOTHING in the pics so far confirms a lack of rust.
look closely at the jack points and verify they are showing the welds, not just bondo'd over.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!