Well, the "flying saucer" is pretty much the worst shape you can make a vessel and it offers absolutely no advantages or benefits over our standard aircraft. It's the engine's capabilities that make the ship what it is. So basically, you can make the ship whatever shape you like, because the anti-gravity drive basically negates everything that would destroy a vessel or spacecraft if it was flying on Earth and shaped like...a rhombus or something.
Personally, I'm fond of the rounded triangle shape. Make a triangle, round out the edges and voila. You have yourself something sleek, sexy and ready for action. Since you're only doing this for modeling purposes, I won't go over what kind of hardware the ship could possess, but know that having all types of weaponry directly outside the ship would be a bad move. Take a look at the F-22, for example. All of it's weaponry is within the ship itself. When it's time to rock and roll, the missile bay opens and fires, then closes.
That might take away from the "coolness" factor, though, so I don't know. People like seeing all kinds of whacky gadgetry on space ships, even if it makes the ship impractical.