Access to a pipe bender? Easy is a piece of pipe in the shape of a big arse U then wood for the deck. Downbars would be easy enough, Gas tank relocate to right behind the cab.
If you don't have access, If you only have few bends, go to your muffler shop. They'll bend it up for couple bucks a bend. (Make sure it's stupid simple bends unless ya trust the guy.. )
That looks nice. I like it. Very simple. I may end up doing that, but I have access to free angle iron and trailer decking, so if I just do a raised flat deck I could do it for basically free. I contemplated doing the gas tank move as well, I just need to look into it and see what all is involved (I am guessing not much at all).