iBook G4 12" 800 MHz-1.2 GHz Upper Case Replacement
Probably a good idea to follow the advice about protecting the logic board with foam. I used bubble wrap on this step, but it probably didn't provide enough padding. When I reassembled everything and booted up (successfully!) the screen had a strong bluish tint. Can't seem to get rid of it now. Oops.
Otherwise, many thanks to ifixit and all y'alls for the helpful comments.