Went back outside to test fit the pieces and with a small amount of hand filing to help the fit (thanks to a wandering drill bit) they fit nicely over the threaded posts.
Once these fit the next step was to cut the upright support pieces. These were simple square shapes out of the same 3mm steel. One needed to be shorter than the other due to the asymmetrical nature of the mounting plate. I pre-drilled holes to use for alignment before I needed to open them to final size. I also cut two pieces of .5 inch round steel tube to use as mounting collars that would later be welded into the cross bar. I assembled these parts together to check spacing and measure what to cut the cross bar to.
Once I had the approximate measurement, I cross drilled the square tube crossbar to the OD of the of the mounting collar tubes and then cut the crossbar directly in the middle of the hole. This left a semicircle that I could use to position the collars for welding.
After welding I ground the welds on a disc sander to make the crossbar ends cleaner. Then I mounted them to the upright support pieces so I could position them in-situ on the car to tack them in place.
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