That is a not a lot of money for a lot of fun. You don't see CHs on Z4s much, which is surprising because they look awesome on the coupe. Lovely colour combo too.
Good luck with the bumper and bonnet. They don't come up very often so you might need to buy some ruined ones and fix them up.
Cheers. Got a second hand bumper 200. Got all plastics from BMW 350. Going to the body shop on Friday. I sold an alpine white one appx 4 weeks and I absolutely love the drive. They feel alive and had to have one.