I assisted with fitting a standard a/c system into a RRC many years a go, one day to harvest all the kit from the donor RRC and two and a bit days to fit it we had to change the dash to get the additional vents and then get an a/c engineer to commission the system.
It's a complete dash removal job and there's a lot mechanical and the electrical stuff to fit so make you have all of the wiring loom.
I would think there will be a bit more work with climate control with the additional sensors and servos.