That's I don't think Gerry Coker would disapprove.
You may be right, although I wouldn't bet the farm that the original designer would like body mods very much. In any case, looking at your eBay listing again, a couple of thoughts:
1. As a long-time eBay observer (and purchaser of numerous cars from eBay auctions), I think that you might have better luck if you offered a lower starting bid. You can make your reserve whatever you like, but if the opening bid is small, it will attract some bids - probably not serious bids - but at least some bids and that shows interest in your car; it helps to create "a buzz." It reassures others that it is a desirable car that others are bidding on, and it encourages more bidding. Some people like to offer an opening bid equating to the year of manufacture of the car; thus, $1960. If no one bids on it in that range, you have really bad breath!
2. One not-very-difficult change to the car that in my opinion would likely improve your chances considerably is to paint the sides red - get rid of the red-white two-tone. The rally cars didn't look like that. A classic all-red car with a white hardtop would, I believe, look more the part and would also help to reduce the visuality of the fender/wing flares, which, again, I believe are considered undesirable by a large majority of potential buyers (maybe not all, but I'd say do what you can to stack the odds in your favor - don't fight the odds).
It has also been my observation that eBay bidders are often reluctant to bid real money because the chances of getting burned are so high. It is difficult for a potential buyer to actually see the car before committing to buy, and sellers often demand non-refundable deposits within a day or two of an auction. Why treat the guy who just bought your car so badly with demands to SEND ME $1000, NONREFUNDABLE, WITHIN 48 HOURS OR I'LL GIVE NEGATIVE FEEDBACK AND RELIST THE CAR <-- I've seen almost that exact text in eBay auctions many times.
Why not offer to allow a winning bidder to personally inspect
and even refuse the car after the auction closes. Sure, require that to happen within, say, two weeks after the auction end, but give people time to get time off work, buy an airline ticket in advance, etc. Not everyone can drop everything, buy a short-notice (high-cost) airline ticket, and rush right out there to put a stack of hundred dollar bills in your hand. Take the pressure off and make it a willing transaction between gentlemen. Winning an eBay auction shouldn't be a game of "Gotcha!" Unless you're desperate for funds and on the verge of getting evicted from the trailer court, what's the big rush? If you have accurately described the car, and preferably included good, sharp, close-up photos of the faults, the buyer shouldn't be surprised. If someone wins the auction and flies out to inspect the car, he's no tire-kicker - he seriously wants to own it. It may be your fault if it doesn't meet his expectations because you either glossed over, or ignored altogether, some important faults.
Negotiating a lower price should also be an option on the table if the buyer/auction-winner can show you some good reasons for it. Do you want to sell it or not? Use eBay as a way to market the car, not as a gotcha-gimmick where you hold all the cards and the buyer has to jump through hoops and pay-up the full price right now OR ELSE.
On additional thing you can do that I believe helps to reassure a potential bidder-buyer of your authenticity is to list your telephone number in the item description. Many people are more comfortable discussing the car with the seller, rather than exchanging impersonal emails. You might even strike a deal over the phone and end the auction. The amount of money that we're talking here is not peanuts, and a buyer wants to be confident and comfortable with not only the car, but also the seller, before he takes two or three days off, gets on a plane, and decides to pay a five-figure price for a toy.
Anyway, that may be more opinion and advice than you wanted, but it's free and you're free to ignore it! Good luck.