Wouldn't that in part be tried on the bench/chassis dyno and rig testing, as well as the track testing. And also go back to what I said about the ply/balsa/ply sandwich composite vs Alclad and aluminum vs steel examples I gave in my previous comments. With a lighter material, that material needs to be thicker to ensure stiffness, but will still give a weight savings.
And as you've mentioned, this is now a proven technology. However it goes back to Marshall's comments about the R18 not having a conventional cassette type gear cluster/differential change, but being more modular to make up for it.
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