Let's start with how the floors looked to begin with. Here's how both footwells looked with the seats and carpets out the way:
First patch goes in. The welding isn't pretty, but it's solid:
Yet more patching. I've added a plate up onto the rear seat mount brackets as these had corrosion so I needed to put strength back into them. There's an area in the first picture where I have blown holes, that area has since had an additional plate welded in. In the second picture you can see my welding is improving a little. It's got to be up to at least a 3 out of 10 now!