This is the left lower rail on the CTS. The plate setting to the right of it was sandwiched between the rail and the floor when it was welded together. I can't use the rail to reinforce the floor but I can use the plate. It is C channel shaped with flanges along the sides. I'll weld it back on the floor and it won't hang any lower than the floor since the floor is recessed where the rail was.
I had to make a temporary fixture on the 49 to mark the height and location at the center of the windshield before I started cutting out the firewall and floor. It can be removed and replaced easily while I'm working on fitting the new firewall. It is just some scrap conduit and a couple other bits.
Most is out. I'll cut for the tunnel and start fitting up tomorrow.