I also welded up my widened rear bumper and am happy with the results. The passenger side of my second bumper was rusted through, so I ended up slicing a section and adding it to my original one. Not my first choice, as it's two welded strips and more opportunity for misalignment, but it was this, or chop out the corner and patch that. I may need to either adjust, or shim, my rear bumper bracket to get it to sit level, and then I can revise the side brackets to fit. Since I moved the bumper in closer they won't fit as is.
This weekend I finished up the gas tank filler neck area. I had to made a recess in my box to clear the trunk latch. I also built another box in the trunk floor (really using up the last of my old original passenger door skin) to locate the original filler neck rubber sleeve and bracket. I shortened the sleeve and will use a clamp to help seal off any fumes.
I also started the fuel filler neck. since I had recessed my tail panel, and the fact that I have always wanted ot add those anti slosh/ siphon valve into the tank to prevent slosh, and am annoyed with how the modern fuel pumps don't work on older cars, the natural conclusion was to update my car with a modern filler neck. I liberated one from an Astro in a junkyard and began hacking away.
I'm also working on building a box for the filler neck to reside in, and hope to continue next weekend
I got the other side installed this weekend, as well as worked on fixing my passenger fender lower area. There's a lot of issues here, and I'd replace the fender altogether if I hadn't already modified the wheel opening area so much.