I have just recently done my first rust repair sections. First time I have tried, cheated a little with the first piece I made and cut and welded the top of it, reckon I could have just shrunk it but I was getting too impatient.
Oh yeah, it isn't a Z
Started with this.
Wanted to try the back corner first so that I could prove to myself I could do it before I went too far.
Then I went and did the larger section, no cut and shuts on this piece. It is all welded with a mig (don't have an oxy/tig). Will get one someday, but for now will just have to live with using the mig and using more lead/filler.