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The Ariel Atom isn't a monocoque; it's a steel space frame. With the steel frame it's a stock 40/60 weight bias.
Of course nothing's saying you couldn't build a car in the same idiom using a CF monocoque but it would necessarily be a quite different car than the steel chassis Atom. If you are concerned about taking too much weight off the front I don't think it would be too difficult to move the front suspension mounting points rearward. Pictures of the Atom appear to place the front wheels ahead of the driver's feed while many race vehicles place the front wheels between the driver's knees and feet. It may require rearranging the pushrods/bellcranks to move the shocks/springs forward to maintain foot clearance.
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