Putting the iPod back together is much harder than taking it apart! Could definitely have used a magnifying glass, but dad's reading glasses helped.
Reattaching the screws and the ribbons was particularly difficult. I ended up replacing one screw with a piece of insulation tape, because it refused to tighten again. But after finally getting everything back where it should be, it was magical to turn it on and watch it light up. It's also fantastic having sound come out both ears, and a working Hold button :) Thanks!