What is that panel welded to the inside of your door frame ? under the door skin ! I have never seen that before !!!
You're talking about the sort of side-impact plate? I don't know, it looks factory to me. It has recesses for the door handle and the same panel is used left and right.
My Canadian mini has the same side impact bar. Damn thing weighs the same as the door it's self. Does yours have the catch on the underside of the door so in the case of a side impact the door doesn't fold in? I wish I had removed mine cause the paint is scratched already in the door sill nubbin thing. Just another odd thing found on Canadian minis
Yes I removed the door catches.