[aerohead]

*The 1/6-scale model would not have the same Cd as the full-scale car until 120- mph due to the Reynolds number effect with the boundary layer.
*The 'Template' can only be applied as is shown.It is absolutely contextual.The alignments must be at identical scale and position.
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*For canopies,blisters,tanks,radomes,nacelles,etc.,you should consult 'AERODYNAMIC DRAG',by Sighard Hoerner.It is the book(s) which is most listed as a reference for such specific information,including Hucho.
*When 'combination',or,'composite' body structures are pieced together,the interaction of each component can create 'super-velocity' effects upon adjoining components and their aerodynamic characteristics are altered by the interactions.
The 'Template' would in no way be appropriate for designing such structures.
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If you're interested in only limited 'low drag',then there are many options.
The NASA Dryden van would be one.This design would be patterned after DOT vehicle length and other restrictions.It does not reflect an 'ideal' solution,just an arbitrarily optimized one.