Attached are a couple pictures of a "mock up" boxside that I carved out of foam in hopes of what I envisioned to do (this was at the start of the project) I always felt the original stepside box and the almost "trailer" type rear fenders did not fit the style of the front half of the truck at all.
Initially, I added a lower body style line that would have flowed with a somewhat hidden running board below the door. As I mentioned, I later removed the running board idea completely and extended the door down instead.
I don't know if I would have still done the lower body line (which I like) and eventually maybe added a "faux" body line on the bottom of the door and into the front fender opening or just removed it and had the bottom of the box without a body line like I initially did the doors?!?
This is a very quick and crude sketch I did at the start (before carving the foam box) it helped give an idea of what I thought might look good.
Here is a picture of the rolling chassis
This is a picture trying to help show the fender to cab jamb separation seam that I came up with. All flush and hidden mounting.
I'm not sure if I added this pic earlier in the thread, but I just like the looks of the project here!