What can't you put back to standard apart from the roof? Won't the nismo rear spoiler come off and put the rear lip back on again? Thought it used the same holes? Wheels you can sell, all the engine bits you can sell, rear lights, exhaust etc you can sell. Apart from the roof which you had sprayed black what else can you not put back to standard as long as you have the originals?
The only things i can see that you would have to leave are the roof, side pillar garnish's and front spoiler carbon garnish.