you would have to completely rewire the trunk and it would disable your immobilizer/alarm system and if you have a computer it would keep telling you you have a faulty lamp. you can wire it in as an accessory but not instead of the light.
forget binoculars for astronomy get a reasonable reflector telescope minimum 100mm (4inches) go for the most expensive your parents will allow you. 200mm is ideal.
plenty of good used ones around the audis use non standard sizes like din double height. BUT digital is coming and any new radio you should have digital or it will become obsolete.
buy a boat with marine diesels these "conversions" never work and maintenance can be a nightmare together with overheating ask why the guy is selling , if you can trust his answer
Forget real player it sends all your info to its home server read the small print! You didn't tell WMP what you had done so it still thinks they are there.