Good evening Cameron:
By adding x-bracing only in the floor, you mainly add resistance to horizontal distortion (x & y components), but torsional resistance/strength requires an x, y AND z components. If you can visualize the 'birdcage' construction of the early Maserati's vs the large diameter tube 'ladder' chassis of the early Cobras, the difference should be readily apparent. The 'birdcage' design was FAR superior in cornering, and because of the triangulation factor, the 'birdcage' chassis is also able to be built slightly lighter as well.
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Will
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