Cd 0.12
The Renault V.I.R.A.G.E. already incorporates much of the architecture your vehicle represents,and even with extended boat-tail only achieves Cd 0.29.
I believe Cd 0.12 is optimistic without a complete boat-tail and more attention to wheel/tire streamlining.
Check out the Summers Brother's "Goldenrod" land speed record vehicle of the 1960s of which your rig shares a similarity.This car tunneled out between Cd 0.11 and 0.12.
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