greenfieldboy

1) Have a look in the Fabia and Octavia sections - vRS models have coloured calipers and there are several posts covering refurbishment of vRS ones or creating lookalikes. It goes without saying that whatever you use needs to be heat resistant and very carefully applied
2) No idea what this tube might be especially if it points upwards and is open - this would presumably encourage things to fall down it - presume you can't see where it goes? Has the car perhaps had a set of air horns at some time (unlikely I know)
3) You won't break the internal door handles, the door card will come off or the release mechanism will break first - my friends wife didn't understand 'anti-hijack' locking and when the passenger door wouldn't open last week she just pulled harder and harder instead of letting go and trying again. The door handle won I'm pleased to say! I let her off as I'd just brought them back from a beer festival
You can buy chrome covers which just clip on and make them look a bit more robust/classy - don't know how well they fit