I used new drill stem and cut spacers for the 1" shaft for extra support, pounded them in, then welded ends up. They came out really straight.
The ends i used 3/8" plate.
The rest is self explanatory i think.
I rolled the 5/8" rebar for the 36" wheel with no problem.
It dimpled my rollers up a bit though.

I need to add springs under the top roller bracket. Something that can slip over the 5/8" adjustment bolts.
I just haven't found the right spring yet.