Very cool mock up! Wow that's gonna be a hauler w the extra lift axles !!! Been seeing quite a few trucks w extras lately loading up at Cargill salt mine just down road from work.
Idea for the chrome mis match, how about dusting all them w dullcoat for a machined wheel look ? Wouldn't take long for those polished up to dull anyway on a job site...then your weathered box treatment to tie it together