Interesting work, Psion
. I like the nacelle fronts, and the idea of having exposed components is interesting and based on sound reasoning. Keep in mind, though, that we're pretty much assuming the craft is capable of atmospheric entry and planetfall, which would require some degree of shielding and structural bracing. Although there's no certainty on that point; the book never really specifies. I'd be fine with it if you chose to take yours in the direction of a strictly spacegoing design while others went with landing-capable approaches. The variety in the designs is really cool.
I'll update my blog entry to include this new image.