David,

That is a really good book! But I am biased to say so because my name is on the credits.

Prof. Meggiolaro and I are slowly working on a version 3 of the Tutorial, since some information changed or must be added, specially on LiFePo4 batteries, brushless motors and materials (magnesium is ok for combat, but not as good as the numbers let us belive).

Cheers,
Eduardo