I see many post on here where folks say I want to paint my car in my garage so my question is why? If your intention is to paint many vehicles over a period of time I'd say maybe worth it, but consider the risk like lawsuit happy neighbors. If your only considering doing your classic you'd like to keep I get it, but I'd suggest an alternate approach.
RENT a booth. I know this won't be an option for everyone but i recently did a car and I rented a professional booth for 250 dollars day had another one offered for 1000 for the weekend. If you've prepped you car properly should be a cakewalk, plus look at the positives clean moisture and oil free air, enough compressor power to do it right, proper drying and overall a pretty clean process. Just a suggestion, but it's worked for me on several projects thus far.
Best of Luck

As you said, not for everyone, but an excellent solution. Saves time, money in setting up and fans etc. and is safer as well as offering the benefits you outlined.

$250 a day? I'd better pull my finger out and build this new booth of mine.