Jeff, that's a great idea, my only problem with doing that is figuring the height of the whole mirror, as I am building each of these kits for the first time, and the destructions are vague as far as placement, I'd hate to get the mirror bracket too low on the door.
Anthony, yes I do, are you hinting at pinning parts?
thanks for the ideas guys, I did get them together and mounted on the truck. I went with Carls super glue suggestion, and opened a white western star kit to use the cab for reference. I started by gluing the mirror itself into the C frame, then glued that to the lower bracket, then added the upper bracket. before it 'set', I let it tack up, then set it on the other cab [had the cab propped up on it's side so it was 'level'] so I could get the mirror assembly close to a proper fit, then let it dry.
here is where I ended up,
I managed to finish up the truck today, still need to complete the trailer, but look for an under glass thread soon....