I've been quoted £70 for mine to be carbon skinned. Exactly the same price as dipping, which I think is currently hideously over-priced for what it is.
Welcome, mate
Hope you enjoy the Zed when you finally get driving it
Have a look here and let me know if you're interested http://www.350z-uk.com/forum/85-northern-ireland/
you really need to get it polished up to a smooth shine first, that should take you about 50 hours of labour, unless you have metal polished equipment, then you can spry it with a nice candy red or the likes
I just did a little search and found the headers for just over £1000, so that means they charge near £1700 for the cats alone
The only thing unique about this system is that they incorporate HFC's in a system with long tube headers. However, the likes of Powerflow will do the same thing for you for a tiny fraction of the cost.
Possible to repair? Maybe you could chop both tailpipes off and get new ones welded on? Atleast you'd still maintain the exhaust sound you currently have.