Personally I would say the car itself is worth about half of what they are asking, and all the addons are worth the other half.....BUT it would be difficult to find a buyer who wanted it already set-up like that.
I know what you mean, it's not 100% the way I would do it but it's tempting and not too far away from me. My plate is full anyway with the to 100e cars.
It's a pretty neat set up. It depends on what else comes with it. I am also a bit wary when, after all that work, a seller says it could be running for just a couple hundred bucks more. So get it running then...