I see three possibilities - first, there are instructions for making
an 18-note movement in the MMD archives from a friend of mine who
actually did it.  If that's all you are looking for, that's your
easiest and cheapest way.

Second, the Porter Music Box company can punch new disks for the
15" Regina disk player.  Paying their tooling costs and buying the
first disk from them will be expensive, but not as expensive as
trying to build your own cylinder box from scratch.

Third, you could build your own cylinder box.  This requires skills
in many disciplines, and not even the actual makers of music boxes ever
had all those skills resident in one person - the old music boxes were
made by teams.  One fellow would build the cases, other would make and
tune combs, yet another would make and pin cylinders, and so on and
when spring came and the snow melted they would all get together to
assemble the music boxes that their Swiss music box company was
going to sell that year.  You'll need a master furniture maker with
marquetry experience, a first-class tool and die maker or instrument
maker to do the machining and assemble the mechanism, and probably an
MMD person to help you lay out the pin pattern on the cylinder and to
help make the template.  I don't think it's practical to make just one.

Mind you, I do think that if you acquired all these skills you might
make a good living producing modern, hand-made music boxes in the
antique style - but that's a career, not a path to getting a box made.

I'd go with Porter myself.  They are located in Randolph, Vermont.

Good luck.

regards,
Larry
home: http://www.smith-house.org/
work: http://www.wildopensource.com/