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I see four areas to resolve—the nose, tail, cockpit and suspension. It looks like it will be as your examples minus the side pods.
You're set on the nose. Your examples have no boat tail at all, room for improvement there. Open or closed cockpit? Will you reuse you current A-arm setup?
Exposed suspension parts and the roll bar will be a big part, maybe half as the body is optimized, of the total drag.
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