Here's a little something I started based on the Archer shuttlepod from Star Trek: The New Voyages.
Their version:
http://www.startreknewvoyages.com/do...er_shuttle.jpg
Mine:
Since the New Voyages is semi-official (it's endorsed by Paramount) and the shuttle is basically the El-Baz shuttlepod from TNG with some minor changes, I'm following the canon line and building an intermediate design with Phase II-ish nacelles.
