Looking good. I try to avoid welding on frame rail flanges but it looks sturdy.
That is absolutely true, you should avoid welding there. In this case, I hatched this plan because I didn't like the idea of conventionally "plating" the frame in that area. I honestly think that you could easily do more harm than good that way. You always introduce a potential cracking spot where the welds end(I did too, albeit in a better spot imho). I think that what I did more closely mimics a factory boxed frame. The factory front section of my frame is welded together in similar fashion. Time will tell. Truth be told, I'm most concerned with the crossmembers and brackets that had to be sectioned and welded to the new inner frame. I will be keeping an eye on those for sure, but the gooseneck hitch itself acts as somewhat of a crossmember too. I would think that should help a little with the torsional rigidity.