There are three things welded.
Gage wheel caster frame - 1x2 wheel carrier cut at a 45 and welded to short length of 1x3.
Lower tabs for gage wheel height adjuster - the pix show these with u-bolts, I was experimenting with best location. They are now welded to the 2x2 locating arms.
Tool stand - 1 1/4 tubing welded to 1/4 inch plate.
Those three things had to be welded. The rest is take-apart. Either for maintenance, or because I might want to reconfigure into a different tool, or because I wasn't sure it would work and wanted to be able to re-do easily if need be.