I'll be doing the same with my 46 come spring Jim, getting an assembly diagram is just about impossible, I know from other forum entries that you assemble the body parts lose as there will be adjusting to do. Brads page has a diagram of the front grille and smaller parts but from what I can figure everything seems to be attached to and supported by the rad support while the rear of the fenders are bolted to the cab. Seems like a bit of a puzzle with each part supporting the other but it will all come together. sort of like a modern day energy absorbing front end.
Good luck, Bob T