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Of course a fully rounded nose and aerodynamic shape would cut Cd. And making it five feed wide with wooden extensions to HF trailer makes it more comfy for two but also sticks out wider and increases Cd. I'd still make it five wide.
I guess the low profile and tucking into the cars slipstream is the real drag reducing design of the teardrop. The aero side profile is perhaps more style than substance apart from that. some people even put luggage racks on top of them adding lots of braking effect;-0 There are several builder forums you might want to Google for advice and ideas.
It sounds like you're onto a good start.
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