OK, listened on headphones in my studio. First blush is the acoustics didn't sound as good as they did on my iPad - maybe a tad too bassy. But the vocals otoh sounded much better.
FWIW, I would pan the acoustics much wider. It'll open up a pocket for the vocals in the middle. I often go full left with one and full right with another. Also try and eq them to rid some of the bass and bring out the sweet highs. I'm guessing they sounded better on the iPad since the iPad essentially has no bass.
The vocals sound pretty good, but there are a couple of timing issues. Most people probably wouldn't care, but I'm a stickler for stuff like that. And in a DAW they're pretty easy to fix. Either move them to line up with the other vocals, or if that doesn't work, clip the beginning of the track(s) that starts early. By itself it'll sound weird, since the starting consenent will be missing. But in the mix you really won't notice it at all.
Good job though. CSN&Y are pretty tough to cover.
BTW, also listened to 4 and 20 and find the same issue with the acoustic. Too bassy. It's either the guitar itself, or the way you're recording it. Too much boomy low end imho.