Man, that's pretty damn rusty. I wish I had some useful advice for you. I felt obligated to leave a post since I've got a 76' 300D just like that. The rust problem on mine is probably about as extensive as yours. I can tell you what I'm going to do with it pretty soon. I'm going to get rid of it because I just don't have the money to restore a car with rust like that. But, on the other hand, if you have enough money to repair all that rust, have it painted, and get it running again, I know from experience that a 70s model 300D is very pleasant to drive.

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"There are a lot of pebbles on the beach, but there's a Little Rock in Arkansas."

Logan

1983 300D Turbodiesel
1976 300D Rustdiesel