Just guesses here, but here are some things to consider if you were to part out the car...
Mangusta wheels: $2500
Side Glass (in good condition): $1000
Windshield: $1500
ZF Transaxle: $5000
Misc body bits/surfaces: $2000 (or more)
But, if you can't afford to sit on it too long to part it out over time the quick and easy solution is the $7500 offer and you're done with it.
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