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Here's a quick low-poly design exploration I put it together way back in 2001, when Star Trek: Enterprise first aired. To be honest I would have preferred if the NX class bridged the style between NASA's primitive spaceships we have today with Captain Kirk's original Constitution Class Enterprise, so this was my take on that concept. For example, the impulse engines are designed to resemble large, conventional rocket boosters.
Note that I believe this may be the first design that utilized a conical secondary hull that integrates into the primary hull, which was later done on the Archer class, and NASA's 'ISX Enterprise' warp ship concept.
Back in the day I released the ship as a mod for the old Starfleet Command PC game (you can download it from my site (www.staryards.com), and I believe it was ported to a Star Trek: Armada mod, too.
Credit to Pneumonic81 (Rick Knox), whose Daedalus Class SFC model I used for some kitbash parts.