I owned a CX limo long time ago. It was a foot longer than the normal CX. Loved it. The power steering was the best ever and how the car was riding on the road. It was like floating. Best speed was about 130km/h or 80 mph. It was more like sailing. The problem was rust. And the hydraulic system. Parts did cost a lot but no problems at all getting them from Citroen. The engine, brakes or electrics will not be problematic. Interior will stay good. Rust and hydraulics will as I said be the main issues. Getting parts today for a 30+ french car should not be difficult. But you will have to order from France. So freshen up your school french. 12K for this Wagon? Not bad at all.
This would be a head Turner at car shows but no one will probably ever say "we had one of these when I was a kid"