[TomH]

A point missing in the "frame rigidity" discussion is the negative effect of frame flexure on steering and braking precision while managing bumps in the road and >400bhp. Today's frames achieve rigidity via structure and materials science versus the '60's strategy of "mo mass mo betta"

With a CAE toolkit (Incl. FEA) a small firm like FFR can easily design and test at a rate better than 100X what was possible in the '60's. When you consider that today's efforts reverse engineered the old frames as their point of departure; there can be little doubt that the "is it live or is it Memorex" question favors the copy over the original.