Quoting Sam Parkhouse
Do you reckon you could tell me how you built the general shape of the ship? I'd love to make something like this.
Really, to get the shape you wondering about sometimes you have to do a lot of S.N.O.T. (Studs not on top) work with smaller pieces on the side, front or back of creation. Remember, smaller pieces mean better detail, but in some cases you just have to use those big ones (cockpit pieces or or you can use the big ones creativly). And sometimes alot of tiles can fit in to make it look "Non-LEGOish".