There is no way I would buy a car whose body has been mangled like that. What do you want? a boulevard cruiser? Because this car is no longer an NSX. It is a chop job for someone who wants to drive around the mall looking cool in a car that's "sexy looking".
You talk about turbocharging but then you want to start with car whose spine has been removed? I think you need to seriously ask yourself why you are buying an NSX. If you want a convertible keep what you have. Or buy a Miata and enjoy open air motoring in a real sports car and save the rest of the money. If you want an NSX because of its performance, then why are you even considering a car like this?
Sorry, I think this car is junk.