"Spats" : I hope my response didn't come across as "thanks for nothing", because that's not what I meant. I appreciate your help. Not your fault I still found myself confused.
"RJ": I'm good on NFA. What was confusing me was whether anyone could convert a pistol to a non-nfa rifle and back, or if it had to come in a kit by a manufacturer. That part was a bit unclear to me, and still is based on the way they have it worded, but I have no problem accepting your take on it.
The other confusing bit was how they describe converting a pistol to a 16"+ barreled rifle is not making a "firearm", but converting it to a -16" barreled rifle is.