Seriously man, you should write a book. lol
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To the OP, alot of what you ask if difficult to answer, we are not there. Some of sound deadening, most 'rattle control' is applied situation by situation.
Someone already mentioned adding sound deading to the panel(s), this would help add mass, lowering the resonance point (and volume) of the the panel(s). Someone also already mentioned placing soft material between the two offending pieces, at the rattle point.
Both of those are good suggestions. There are other options. Look at adjusting your latch to 'tighten' it up if its loose. Various things to try and quiet down noisey linkage. Etc etc... But, without being there and looking your car and your situation specifically, we can only make vague guesses. Look at what exactly is rattling, and use a little common sense to stop it (again like placing soft mat'l in stategic places etc).