’01 Clio RS (“Sport 2.0”) – This and that, but important!!!

Dear community, I would like to buy the vehicle, but have some questions, unfortunately these are partly very specific…I hope you can still help me: 1) How much would a repainting of the entire vehicle cost? It should be used a simple black-metallic. 2) Can you buy the car with 40,000 km mileage without hesitation? 3) What are the most important and most common faults/damages (even with this mileage)? 4) Can you buy the tachobele illumination/the illumination of the needle (self-employed) change or change? 5) Chiptuning: Which product is “the best” insofar as it is recommended? 6) Which radios/speaker systems fit in the car? So, that’s it for now – thank you in advance, I’m happy about your help… Felix