I'm sure it could be done, but don't forget, they can't do the door jambs, hinges, the underside of the trunk, trunk sill, etc.
All that would either need to be cut in with paint before you have the wrap installed, or it will look like it does now.
i would figure the retail cost for a base wrap on a GN would be between $6500 and $8000.
We just did a white Jaguar XKR-S in matte black (ho hum, that shit is so worn out..). Looked great, until you opened the doors, lifted the bonnet or opened the boot. Then it just looked stupid. The guy paid $8500.