Hi and welcome to the forum,
major probs :
1&2 Change the fuel filter
3. brake disc do you #3 here:
RealOEM.COM * BMW E34 525i FRONT BRAKE-BRAKE DISC
If so you need to drill it out ive done this many times.
minor probs:
1. You might get lucky on ebay UK or Germany (DE)
2. Door trim clips or a new trim
3. New clips
4. New lense you dont have to buy the whole unit.
I would say you could virtually sort most things at the breakers yard you have found.
Good Luck Im sure you will get there in the end.
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VELVET BLUE UK INDIVIDUAL , IM THE LAST 
UNITED WE STAND DIVIDED WE FALL
I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint!