Firstly I very much doubt he has been "overlooked". I dont know who owns the rights to his songs, but it may be Neil himself and he seems to be very much his own man. Wouldn't surprise me if he just didn't like making his music available to other commercial interests whether they paid or not. That's just a feeling I have.

With respect to Powderfinger, I had a little "Neil Young" fest a couple of years back and learned a number of his songs. Powderfinger was one of them. When I say "learned" I only played electric rythm parts, but they were a blast. I played along with a live version of Powderfinger and loved it ( no way I could learn his solos!!!!). I found the basic chords required in a free online site called "Ultimate Guitar Tabs " or something very close to that. Just find a strum pattern that works for you.

Give it a go.

Alf