Interesting that you mentioned the lights, as I was contemplating that, too. And possibly a license plate bracket that sits between the 2nd and 3rd "pipe", but pushed back closer to the bumper.
Given the information that you've provided about the mounting, it might be worth considering having the 2 mounting pads bolt to the rest of the assembly, and making slots to accommodate the variances from vehicle to vehicle. At that point, people could bolt it, then weld it if they so choose. If not, they'd still be able to use it w/out an issue.
We'll see how it progresses, and thank you very much for the file![]()