Yeah, the floor flexes A LOT.
I had the torsion bars backed off, had the car as leveled as possible on the floor before I started cutting. Used the lower crossmember piece to hold the bolt holes all together when I started with the welding of the top piece. I wasn't worried about the car bending after that but the floor will still flex in areas not by the crossmember until its all tied back together.
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The floor is then tied into the upper crossomember and then I had patched the 4-speed hump back to an automatic floor and modified from there. I bought a new automatic carpet kit and it isn't noticeable. There is a slightly bunched area on the passenger side right at the front edge but it's fine generally.
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