Insurance question about a show car

Hello, I have a question about my car which is almost only a show car and nobody could tell me anything about it. I have a Golf 4 R 32 which is completely converted into a show car. Completely clean, multimedia system with playstation and 34 inch monitor etc. In addition a candyapple / pearl white painting that has scratched me a contemporary a few days ago, who got God’s thanks, completely. according to Dekra expert a damage of 5300 euros. My question relates to something very unusual. A friend of mine, who is a restorer in the church area, has made a rather unwholesome proposal for me. My car kopmlett, since he must be completely painted, must be covered in gold leaf. He would do the work with his master free of charge, I would only have to pay the purchase price for the gold leaf. Aterial value would be estimated at 9000 euros, which would be worth the thing to me. My questions about this are, what does it look like with the operation in the road traffic! Can I still move by car in the public traffic room? What if one drives me in the car and what does this look like with the comprehensive? As said, car is almost only on the way as an external item, but I also drive around it, as an example, to fetch French fries in good weather. Drive around the 500-600 km in the yes The current value, according to Dekra, is 72000 euros and would certainly increase significantly due to the gold leaf, wouldn’t it?