The top image is a rendering of the Landshark 2.0. I ended up going with the mailing tube due to weight considerations. The back end is actually beveled like PemTech's Bucky Jones Space Cadet (below).
It will also have a set of smaller tubes around the motor mount. In fact, I more or less stole its entire a$$-end from the Bucky Jones. The shark style fins (OOP from Giant Leap) are offset - again like the Bucky Jones. Hey, the fins aren't the same. I'll consider this flattery not thievery :)