Any suggestions on steps/process/discs/grits/etc/ to use to dress my welds and any tips on where to find them if you have any?
Look up posts by MPandC here, or over on the Garage Journal forums. Robert is an expert in the metal arts and has some excellent tips and detailed threads (especially on the Garage Journal) explaining how he welds and dressed butt joints.
I have heard some say they all come from the same place - China! Good luck, take your time and don't get frustrated!!
Some patch panels I have gotten from RockAuto are made in Taiwan (yeah, it's China, but at least not a communist country). Quality seems OK.