Looks great and I to like the oversize tail lights. I made my concerns earlier about the reinforcing at the top above the door. With the majority of the weight being behind the rear wheels the weight and the flex of the box when pulling into driveways etc will cause the corners to crack. The door being single and having those type locks with the flexing may cause the door to pop open because of the small latchs. I hope this isn't the case because it all looks good. I like the floor with the skid plates.
I brought the bracing concerns to my welder and he said, "You have a rigid box that has far more structural integrity the ANY semi trailer, on a super strong aluminum box frame, all mounted on Ford's steel box frame, reinforced with even more steel cross members. If those joints fail, I'll buy your truck and eat it in front of you!"
Now I don't really think he can eat much of my truck but this man has welded a zillion things, up to, and including a pulling truck powered by a jet turbine AND an ocean racing boat powered by TWO jet turbines! I think it will be OK.