[murx]

What was the discussion with mass, acceleration, gravity ?
To give you a clue, The Enterprise class ships from Star Trek would probably depart in three different directions when going warp, both gondles accelerate to warpspeed and the main body would just stay where it was cause the mere force of accelerating just at the outer edge of the structure would rip the lightweight gondles from their 'thin' attaching structures. Either you have the main body of the mass directly in front of the drive (but then you should try to accelerate relative slow else the front part of the ship would look like you drove it against a wall) or you have a superstructure that can withstand the acceleration. But putting the mass in front of the drive gives less trouble and need for high grade materials.
But there is also another thing to obey even without acceleration the mass of the ship itself will form a gravitational force on itself. So if you have a metal staff 1cm thick and more then a kilometer long the staff will twist and turn and break due to its own gravitational force. To counter this you need to shape a form that is balanced - easiest way is a spherical ship. But again this is gets only really important within a gravitational field or at a considerable size and mass of the ship.

murx