leave it alone is the only financially sensible option.
You can see a lot of the extra length between the a pillar and front wheel. That area is much slimmer on the real car.
If the body differences really bother you that much then finish it, sell it and buy the SPD200 from cradeley motor works. Its dimensionally identical to the original and they even offer a mid engined 4wd set up if you can afford it.