I have the VA system in my '69 which was originally a factory air car. The douche bag who had my car before tossed all the heat and air parts so I had nothing.
One note on my experience - I got one of the very first kits they made for this application so they almost certainly have made changes that I'm not aware of.
The system installs very neatly and is complete - also comes set up for R-134a or the old stuff - I took the new. You can do this at home yourself over a long weekend (although I did not have to remove the old system). There is a condenser that fits in front of the radiator. The compressor can go in different locations depending on your needs. Mine went on the left side top above the power steering because that's where I had room. Other than that there are only a few coolant lines in the engine compartment. Everything previously mounted to the engine side of the firewall goes away. When you're done you will have a flat filler plate with 4 hoses passing thru it. Very clean overall.
The entire heater box/defroster/air co unit goes under the dash against the firewall. It's a tight fit but I got it in basically alone. I only had one major problem. There are 4 lines that go thru the firewall - 2 water hoses and 2 freon. Three of them were rubber flex lines and one freon was a hardline with a couple of jogs in it. It absolutely would not go thru the firewall without loosening up the fitting and then you could not get to it to tighten it up. I finally called VA and asked them to make me a flex line as a substitute which they did for free. After that it went right in.
The kit comes with ducting and some converter housings for the back of the dash vents. I had to buy replacement vents because mine were gone but after that they hooked up fine.
I have no idea what installation fees are. I also can't tell you how well the whole thing works yet! I haven't yet charged it up due to other issues but I will in the next couple of weeks.
I think I answered all your questions but feel free to come back with more.
'69 400SB, Richmond 5-speed; '99 HD Road King Classic