I think you'd find much more enjoyment, not to mention huge additional amounts of money and time, by obsessing far less over every minute detail on a daily basis and simply investing in periodic cosmetic maintenance instead - unless what you enjoy most about your car is its ownership and preservation rather than operation. Otherwise, what happens the first time something beyond your control in this chaotic and sometimes shitty world we inhabit and a truck throws a stone into your hood and windshield, you curb a wheel, or some douchebag decides your GT500 makes a better place to leave a shopping cart than the corral at the other end of the lot?
It's like obsessing from the day a daughter is born ONLY about the day she loses her virginity - even if it happens to be a well-kept slightly-used daughter as in this case. It may seem like the right thing to do and few would bother to argue otherwise. But is it likely to yield a relationship in which dear old dad is her hero and protector, or some ogre whose watchful eye she'll embark upon learning to elude as soon in life as possible?
You can do a lot to strike a balance. Buy a set of pull-off wheels and box the originals. Later GT500s make that easy because BOTH the staggered wheels AND tires are such miserable choices for how the overwhelming majority of owners in the overwhelming majority of locations use their cars (when they do). You also can begin amassing spare interior and exterior trim parts to replace the visible surfaced that only naturally become worn over time. Buying over time spreads out the cost and look for bargains which, though not inexpensive, very likely will yield tremendous value and a brand new interior whenever you choose without all of the daily time, effort and expense.
Don't misunderstand. I'm a person by whom the clinical diagnosis of anal retentive is calibrated with a whopping dose of OCD to boot who became so unable NOT to resent every mile that clicked by on the odometer that resigning myself to trading in my GT500 for a new one each successive year simply became an ownership cost that was necessary for me to be able to fully enjoy a car. And that worked well, right up to the points at which the following year's model wasn't necessarily as appealing and they stopped making GT500 altogether. That forced things into a new gear entirely which I freely admit to being very fortunate to be able to indulge - or ownership would be a very different experience to me.
I finally realized that the only way I could enjoy owning a GT500 was BOTH to be able to drive it as often and hard as I like and having one set aside which I could use to rollback the odometer to day one or simply keep in perpetuity. I also still do all the other things like boxing the original wheels and replacing the occasional visible trim piece to keep the one I drive new, but I'm also free to drive it much more often and enjoy it much more fully than I ever would have been able on the basis of having one and only car which represented a finite commodity that eventually I effectively would consume.
Though I freely admit to it requiring the ability to dedicate more resources that many are able, it's also not nearly as expensive as one might think. It does tie up liquid resources, but the net cost is only the depreciation and time value of money which has been virtually nil during the past eight years. And weighed against the cost restoring a vehicle to its delivery date otherwise would cost, it becomes downright cheap by comparison.
Just pray your interests don't also expand into the BOSS 302, 50th Anniversary GTs and the upcoming GT350s which only multiply the challenge while heaping on the additional dilemma of how and where to keep them. My only regret is not fully appreciating the BOSS realitive to the GT500 whose supercharged power, brand appeal and the fear of looming fuel economy mandates swayed the argument. In retrospect, I'd have owned half as many GT500s and twice as many BOSSes and had a whole lot more of different types of fun for a whole lot less.
But it's ALWAYS the GT500 that draws nods, stares, thumbs ups, and requests to take pictures with peoples' girlfriends standing next to it, which happens SO consistently that I recently had planned to trade my '13 Coupe and abandoned the proposition because of compliments I received EACH TIME I was driving to dealership to do the deal. Even my wife understood at that point.