I have a 1 ton step-side, and like it..
Also have 2 ton, and am looking forward to having a 7' x 10.5' flat bed. I am trying to find the pieces for, or someone who can make, an aluminum frame, similar to what an original one would have looked like, just aluminum. Then I'll make the wood floor and add the unpolished stainless strips. I don't care for "hot rodish or somewhat cool" just simple, extremely functional, and practical, what it looks like is secondary to what it actually does.
You may consider designing and building your own bed to give the truck the look you want?
Grigg