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The stock height for a Escort ZX2 is 52.3 inches, from Wikipedia. For easier math, I am going to assume that I have a 2" drop along with 1" smaller tires(0.5" drop from stock), giving me a ride height of ~50". So I need to shoot for 200" or 16' 8". The car is already 175.2" long (14' 7"). According to Hucho, I need to add only 25" of boattail! The full length boattail puts me closer to 5X.
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Fineness ratio seems like the roughest possible guide to optimum ...For an ideal half-teardrop. As you get away from that shape, reality intrudes. The biggest deviation from ideal is the width over the rear tires. Ignoring upstream influences, you'd want the rear 70% of the teardrop after that point. :yikes:
Compare Mair's torpedo with Hucho's teardrop.
Here're examples of fitting the (admittedly squashed and stretched) teardrop, with it's truncations, to the body above and below the beltline, separately:
You could consider a Kammback/boxcavity for the greenhouse (for sightlines) and a truncated teardrop for the tail.