Here I would like to suggest some guideline to anybody willing to navigate to find information on the loved mechanical instruments.

Surfing the web I found different sites typologies which I would classify in these main families:

1. Producers of instruments, finished crank organs or kits
2. Producers of cartons or punched paper rolls to be played by the organs
3. Organs designers who sell drawings and instructions (with books or video cassette) to build different models of instruments
4. Companies selling the products built with the plans of the point 3 above or that supply some components
5. Web sites of self constructors showing their instruments built according to above projects and many mechanical details to witness their work and to encourage other potential builders
6. Clubs and Forums of this sector to seek and receive help and consultancy from more skilled experts
7. Companies selling  accessory software and hardware for the instruments
8. Web sites of hobbysts software applications designers that make freely available their developments which can be employed for accessory purposes for the instruments

A classification like this should match all the tastes, from who is only curious to deepen its knowledge to whom is seriously considering to organize himself to build its own instrument. I intend to address the latter category, into which I identify myself, to make available and to share a few things I discovered surfing since a few years on the subject.