I think with a bit of attention to detail, the AC can be quite functional.
In approximate order of importance:
Remove recirc cover plates
Tony Wa mod[or the electronic version I used, I have connectors to make the harness]
Sealing fresh air door assembly[which fixes the 'problem' the recirc covers 'solved']
replacing upside down AC condensor
Sealing the recirc baffles
Once you are there you have a system that will work
after that you can think about some of the sillier things I did..........