possible? relatively straigh forward? cost? (using second hand parts from a car being broken obviously)

 

Depends on how bad you want air con, can be a pain dash out and all that, IMO probley not worth it, was a recent post on this not sure if he finished it or not! Dash in and out is best part of a day for reasonable DIYer plus all the rest I'd say it's a full weekend then find someone who is willing to charge it up, as you'll have fitted it yourself. price up he parts and decide! Would you fit it yourself? I'd hate to think how much you'd pay in labour!!!!