Piet Paardekam posted a message linking to a forum at

  http://86.83.97.165/orgelforum 

Almost everything is posted in Dutch, so you might think it isn't
worth going through.  Actually, there is a lot of good stuff here,
and some of it turns out to be in English.

I found a very interesting link to a "belly organ" description by
Johan Liljencrants.  His organ has a whole lot of original detailing,
and the description is in good English.  It is found through an index
page of Johan's organ works at http://www.fonema.se/ 

There are also links to some great French grind-organ rally videos.

In short, the forum is worth exploring !

Wallace Venable