Looks as if nobody knows or is interested in your problem.
I sold my old partner a while ago so I'm trying to remember how to.
The door opening handle has a plastic clip surround. A twist of a screwdriver unclips it.
The door pull handle has a covering plastic strip that once removed with a small screwdriver allows access to two screws. Lever from the bottom.:thumbsup:
The door pocket has screws along the bottom and sides ((6?). ???. not sure about that )
The window winder may have a spring clip behind which can be pulled out with a hooked bit of wire or similar, the door panel has to be pushed in from the handle to see it, OR it is a pull off job with no clip
The panel should then pop off with a lever at the clips round the edges.
As far as I can remember that's about it.
Your rattle might be the guide for the window glass rotted through/broken and moving about, unlike the rest of the door its not galvanised.