how difficult is air con to retrofit to a vr6 ?? has anybody done this themselves? i SHOULD be able to get all the bits from a late model car but i'm not sure how difficult it will be to fit. i guess the dash will need to come out to fit the heater box underneath, the front panel will need to come off to fit the a/c rad and the pump and bracket, but other than that is it just a case of routing the pipes, plugging in the switch and temp sensors and getting it gassed up?? any help greatly appreciated.