Here are the pictures of my patch work on the bed floor.
This was Friday evening, right after I got started. I didn't take many pictures during the process because I was too focused
I had it nearly complete Friday night, but stopped with one seam to weld, and a few to grind down. Saturday, I got up and was on a mission to get it finished. The one needing welds I hadn't cut to fit perfectly (the 45* piece that comes from the bottom rib to the top rib was too long), so I had to grind it down a bit until it fit. That's not as easy as it sounds when everything is attached to the truck. Well, long story short, I wound up grinding it down to fit and made the 45* angle so thin where it meets the top rib, it would just blow out every time I tried to tack the two pieces together. I ended up cutting that piece out.
That saved me some time and a LOT of grinding. I didn't want to rebuild that whole piece with welds. Here it is finished, with some extra bed liner removed around it.
And some rust converter sprayed over it all (after it was cleaned of course).
It's not perfect, but it is still the original floor, and there are dents and things in several places. When I go have the bed liner redone, it should hide most of the imperfections.