I imagine you could do it if you got all the parts, off the top of my head I know you'll need

-compressor
-condenser
-evaporator
-low/high pressure lines
-receiver/dryer
-thermal expansion valve
-appropriate controls

not sure if there are any other specific parts needed or not

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1982 300D Turbodiesel, daily driver. Mods so far: Fram 8038 paper filter, 4 brake light mod, Gen II w126 (front) rotors/calipers, boost turned up to 12lbs, non-egr manifolds, water/methanol injection, 4-speed manual
1980 300SD Turbodiesel, project car, nearly ready to hit the street

1974 240D, New paint