Respectfully, I actually disagree with @brother_bethor: I think the distinctive shape comes out really well in the master and having bigger wings would detract from that.
Though I suppose you could justify it by making the 6 mm version more of a ground-attack version, so you could do something different with the missiles/weapons (and I suppose you could add a defensive weapon? Though that's probably not needed if the missiles look like they could engage fighters). Maybe for wings, you could make them longer along the body of the craft, and only a little more protruding, so it would look a bit like a flying saucer:
([])
(my extravagant ASCII version
). Anyway, I mean you could give it a roughly circular profile with longer wings that have curved tapers.
The spaceships look pretty swish, too! It will be ace one day when someone has made matching battleships for all their nifty smaller ships!
PS: Having now been to Specialist Arms again and seen the 6 mm prototype, I can say that I still very much like the same profile carried over. Like I suggested there, the prototype chin cannon looks a little flimsy, so I was wondering if wing turrets kind of above the missile section might be interesting? Possibly partially recessed. The chin cannon could look snazzier if it was a bit more solid, I think.
Alternatively, perhaps you could incorporate the cannon variety as a hybrid bomb/gunship for escort duties?
