There's a good site here:
www.acifa.net
It contains history and other material. My instructor has a brief website here:
CHINESE/INDONESIAN/FILIPINO MARTIAL ARTS
The style is Indonesian and Chinese with considerable FMA influence. It's primarily a close-range style.
Examining the weapon and providing a tutorial on it is not its advocacy over
other weapons. Rather, it is an analysis of whether the weapon remains viable, and I am contending that it is. It is simple, simply constructed, and effective when applied.
I wrote a book on using swords for self-defense, published by Paladin Press, called
Street Sword. It is not the advocacy of carrying a sword over other weapons such as knives and firearms. (I carry a pistol, not a katana.) However, it does the same thing that this booklet does -- it examines whether the weapon is a viable alternative if, for whatever reason, it is what you have available.
Were I to carry nunchaku I would carry them in my waistband behind my hip or hiked up to the side, depending on whether I was sitting. I have a pistol license and live in a state where the nunchaku are not legal, so I don't even have any at home with me in this state. There will be places where the indivdiual might be able to get away with this, though not many. There will be more places where the individual could at least own a pair in order to get familiar with them. Carrying and using them would then be something of a worst-case scenario in which other more legal weapons were no longer available or simply not present at the time. One of the primary reasons I like the nunchaku is because they can be easily constructed by just about anyone, should the need arise.