My friend wants to get a 350Z, but there's a few issues. He has the money, but he wants to make it into a 4-seater. If anyone knows if this will mess up the frame or any other type of important component to Z plz tell!! He wants to just take out all the stuff in the back and replace it with 2 or 3 seats if possible. He wants to go through with this because he adores the Z!! So I need as much helpful info as possible and possibly anyone that can do it, and how much!!?? Thnx.