A/C Question? After Market System

I would keep the OE climate box. You should be able to use the AC condenser. The other parts in the engine bay can be modernized, though you might want to keep the expansion valve. My A's were non-AC, so I added an under-dash knee-knocker AC box, but it greatly adds clutter and seems silly to have 2 different blower motors. I could have used a new climate box, but it wouldn't work with my dash cables. Most have a separate remote.