The lower seam isn't as bad in some respects, and worse, in others. But as I'm fed up with this heat, I'm going for an expedient approach.
There's about 5mm of rust between the angle and the pressing, but only a few were ballooned out. I've cut around the rivets and removed the rust. I'll weld in new tomorrow.
So, bar a bit of grinding and simple welding. It's done. I'll pause once that's all done, as I've other stuff to sort. But next week I'll go at getting the rails sorted, at one end at least.
Final bit of welding and grinding done. I'll pack up after dinner and that's it for a few days.
There were a few holes in the first welds, where the old material was thinner and I was too lazy to cut a new patch so spent twice as long chasing rust with the welder. So I chased the rust more, then ground it back again.