130 mm will nearly fit in the standard dash locations, just need a bit more depth, if you can do that I would get the 130mm componants in there, but thats only because i like things looking stock ( probably because ive been robbed before!)
I would fit the 160mm in the doors angled slightly upwards if possible depending on if they will fit in the stock mountings ( if you have them on your mk2 ) or if you are going to make a build.
and leave the 130mm coaxes but if you really wanted to put them somewhere, i would put them in a small build where the front and back doors seperate, near where the front seatbelts dissapear into the pillar but nearer to the roof, unless of course you just fancied sticking them in the back somewhere?!
and the tweeters either ( if you want to do a proper job) in the windscreen/door pillars, there is a sticky thread on here about how to make it look good. or (for quick and easy!) on the roof lining near where the grabhandles would be in the back, but in the front, if there was any!
as for the angle of them all, just as 'towards' the listener as possible really, so, basically if you could use them as headphones that would be best!