Success! I finally got it to work by re-running Netbook-Installer and then re-installing the kexts afterward. I also used the updated VoodooHDA files from the link that you provided. I don't know what was wrong before, but it's good to know that a reset might be able to solve my problems (now and in the future). I think that solves all biggest issues—the 1000HE seems to be running with ~95% of the functionality of my MacBook Pro, and I can live with that considering how much the OSx86 solution cost (and how much I learned about the innerworkings of OS X!).

Thanks again!