I've only got one k-member left and, for now anyway, it's being kept as a spare for ?????? Also, due to the time/effort to remove a k-member from the car in the wrecking yard and making the DC k-member I can't/won't beat Schumacher's price for mounts, but I still prefer the DC method. The welding is actually the easy/fun part of building one.
I also didn't weld until a few years ago and I'm still somewhat of a novice. I do fine on things like k-members, but when it comes to the fine art of sheetmetal I'm a bit of a hack.