I'll guess I'll add that I'll be participating in this endeavor also.
Luckily in most cases, the principles behind the build process are identical no matter which manufacturer makes the components. All barrels are attached in the same manner. All lower parts kits (triggers, safeties, take down pins, etc) are installed the same, with exceptions for some aftermarket units.
It shouldn't be overly difficult to show the installation of both a carbine length 5 position buffer tube (with any mil-spec stock sliding onto it) and an A2 stock. The same should be true with a standard front sight post gas block in addition to a low profile gas block to be installed under free float hand guards.
Speaking of hand guards, this will likely be the most challenging aspect of the class. Except for standard hand guards, each design is installed differently. Directions are included with the hand guards, and they're all pretty easy to install....just different.
