David ... sorry for the delay.
Nice truck and bed! I saw some interesting hardware on the
Hansen Wheel and Wagon site...
I'm thinking more along the lines of the bed on the truck pictured in the photo below. But I haven't committed to anything yet. I have a bunch of oak from two trees we cut at our farm and I have some thick hickory slabs I've been airdrying for about 3 years I'd like to use for the cross pieces.
Do you need the lower back piece for your cab? I have three extra ones that are not too rough.