Here are a bunch of articles/videos/tutorials I find inspiring. I’ll fill this page bit by bit. Suggestions are always welcome.
bookNIAROF, by Antonin Fourneau & Douglas Stanley, probably the only book about alternative controllers yet (in french)
Vidogames That Go Squish, by George Buckenham
In Praise of coin-operated Machines, by Tim Hunkin
An initiation into museum design, bu Tim Hunkin
Installation Required – Why you should build an arcade cabinet for your game, by Alex Johansson & Jonatan Van Hove
Installation Required -The incredible potential of custom controllers, by Alex Johansson
Controllers Control Everything (or why we need alternative controllers) by Mark Brown
Game Design WTF, by Adriaan de Jongh (Headstart 2015 conference)
Jeux Pluriels, a beautiful short film by Nicolaï Troshinsky about physical games (trailer only – french)
Petits essais dessinés épisode 7. A drawn essay (french+english subtitles) by Oscar Barda about controller hacking & games exhibitions
Out of ideas to make alternative controllers? Check this twitter bot!