I have seen books on music box making, or at least articles.  What you
need are clockmaking books.  The Cleveland Public Library, for example,
has quite a number, as I suspect any large city library would.
  A lot of clocks had musical movements, and these are covered in great
detail.  I distinctly remember seeing plans for the construction of a pin
barrel, including the layout of the pins.
  Gear cutting, pivots, movement plate drilling, mainsprings, and all the
other stuff is covered in regular clockmaking books.  These usually start
with a chapter on which tools to buy and how to tell one sort of metal
from another.
  The only problem that I found with the library books on clockmaking
that I read was that many of them are from Britain and date from the
1920's.  This makes some of the terminology a bit obscure, sometimes.
But they're fun to read and the principles are sound.
  S. LaRose and others will probably stock more recent books.

                             Mark Kinsler