Longer than you can afford.
The traditional P-38 drop tank is 3ft in diameter and 12ft long, for a fineness ratio of 4:1. A half-body like The Template would be only 18 inches high.
12ft long at a fineness ratio of 2.5:1 would be 4ft wide and 2ft high.
Here's how I developed the shape I used:
A 6v octahedron-based geodesic sphere is stretched in the rear hemisphere 233%. The result is maximum camber at the 30-70 split.
Height is still equal to width, rather than half, but the equator is dropped. (technically the top hemisphere is prolated and the bottom hemisphere is oblated an equal amount. I forget how much) So it's symmetrical side to side but asymmetrical front to back and top to bottom. The bottom is further flattened for ground clearance.
It can be easily varied in length to set the fineness ratio, and individual dimensions can be picked off the model. Here's the process applied to an octahedron with a frequency of 4v.
