[pound41]

Most of my B pillar is intact as are the rocker boxes. But most of the floor is gone. Which I am replacing. In looking at mine today I don't think it would be that hard to make. since most of my floorpan and rockers are cut out and the end cap on rocker boxes are out. I have a pretty good view.
The piece circled in the pic follows the body lines. Start with a repo patch of the section in front of rear wheel. Measure the 1-2inch piece that backs the same area as the patch panel. Cut slits top/bottom and maybe cut one in the middle. Hard part of countouring that done. Bend flat. You now have the section that now backs the b pillar it knotches around something and then comes down. The curved part at the bottom matches the lower curve of the body, You have a pattern. The bend that has the bolt holes would require some work. But I think what i came up with in looking at it rather quickly is a place you could start