hard to tell what I'm seeing there, how come the door doesn't appear to go all the way down? is the bottom door skin missing? just the inner shell showing there? cab corner been replaced? and the cab is off the frame? could be a bunch of problems there, or maybe none at all by the time you get the metal work done
a shot of the whole door would be better, looks like the gap may be widening at the bottom, and the lower crease line is low [and the pin stripes] which means it needs to swivel up at the back, forward at the top, but it doesn't look like a terrible fit at this stage, need the cab bolted onto the frame and the front sheet metal together before you do the final fitting and can judge the real positioning of the doors, need to watch the fit on all 4 sides at once
Bill