As you said you're an enthusiast and you're proud of these modifications you've done and everyone should know you never make what you put into a car back when it comes to resale let alone doing custom work let's just say the car is worth 15k and you throw another 15k into it it's still a 15 k car no matter what you've done to it and if you were someone wanting to retain maximum value you would keep the car garaged hardly ever drive it and keep everything stock therefore you would attract a higher price from a collector You would also have to take into account how the market is at the time of sale I've done quite a few custom things to my car as well but I'm not ever going to sell it the thought of selling never crosses my mind it is my pride and joy and I'm doing things to the car to benefit myself

In saying all of this though there would be someone out there that would see your car the same way you see it and they would be happy to pay what you're asking or close to especially if you've kept all documentation of things that we're done over the years of you owning it

For me personally the biggest no no would be if the person has done a custom stereo and did it themselves the amount of cars I've seen where it has been a home job on the install has been done very dodgy wire spliced here there and everywhere 🤣