I know it's a crude sketch, but I think it gets my idea through. I feel confident that I can do simple welds. I haven't done any in the last decade, but I can do some practice beads. Since the vast majority of the force is going to be directed down towards the ground the welds should not have to be the best. I do plan that many of my first projects are going to be tools.
I have access to some one-inch plate, quite a lot, a few inches of that welded under the rail would act as a stabilizer and give the rail some more height.