Nice review Gary, I've been waiting for this.
I have been using this CD for a while now and find it extremely helpful, keeping in mind one thing that you clearly mentioned, which is key to understanding this vehicle in my opinion.
"The vehicle is a nicely restored early M2 (fixed headlights, roller in front, single coil idler spring) which was remanufactured into an M2A1." A very important fact and I was glad to see it mentioned, very nice !
Just for the sake of talking out loud, the other things that tell us this was originally an M2 is all of the bolts for the skate rail, which were put back in their holes after the removal of the rail. Factory built A1's don't have these. Also, the anchor points for the original tilt hoops, which are seen as small metal rods welded to the stiffening rib, directly under the added M2A1 tilt hoop brackets. Of course the fact that the interior seats are centered and not off to one side and the full size stowage box under the pulpit mount are even more proof that this vehicle began life as an M2 and not a factory built M2A1.
Excellent review Gary.