I agree, take it down & do it right the first time! It will never look right trying to touch up the rust spots. If you did find a paint that matches the faded JD green, it won't fade the same in the future, making it look blotchy. Good luck with it!
I just picked up a pair of 70's (well, 1 & 1/2), the 1/2 is for this winter's project. The complete one has a "stuck" engine, will work on it when I get to it. ~~ grnspot