Wont suggest a completely new setup. Only those things which are needed to be installed or need to be replaced should be done. Early 2014 i got the n sorted in my khyber. Needed to get the bracket for the compressor fixed, new condenser, new pirping, dryer and gas charging. Took an entire day to get all this sorted out. Total cost was 11k.
My estimation is that a completely new setup will set you back close to 20k to 25k. But there's no real need for that. Just have the things available back to proper working conditon and reinstall all missing items and you should be set