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Well that explains the flex, when you remove the factory floors and rocker panels, you remove what's left of the strength of the chassis. The chassis itself is relatively weak without the floors, floor supports, and rocker panels, those are the structural parts that hold it all ridged. I would support that chassis on the side rails too. you don't what a problem with sagging frame rails later on down the road. you know like on the older coupes that the rails sag in the center, that would cause a world of problems for that fiberglass body, that X-member should fix the problem but there is no such thing as to much chassis strength!! good luck.