Well, i finally did it, i got my guy on top of the star destroyer, and let me tell you how freakn awesome it is walking on top of it, i'm almost positive its up to size!  The guns look so big when you are looking it from the prospective of a guy walking around O.o  It makes me realize how awesome it would be if there was a ship boarding level, one where you actually need to land on it.  Here are directions for getting your guy up there, its kinda difficult and it will take a long time, but dont give up, its very rewarding.

1.  with a friend, join a working empty escape from hoth server, believe me guys on the other team will shoot you.
2. make sure you and your friend are both imperial.
3. who ever is the better pilot, go into a tie bomber but dont go anywhere, and the other guy should jump right onto the cockpit part.
4.  Slowly (i mean really slow) the pilot should fly out of the of the hangar with tilted down a tiny bit so you can clear it.  Just remember go slow enough so the guy wont fall off, it might take a couple tries.  As for the rider, make sure you stay center, and dont go prone.
5.once you clear the hangar, tilt slightly upward and continue up carefully, you will eventually reach level with the top of the destroyer.
6.the pilot should extremely carefully touch down with the tie bomber, and the rider can then jump off.
7. the rider should make a squad, then the pilot should join and spawn to him.  Congradulation!! you have succesfully stood on the top of the destroyer!! feel free to have races across the destroyer, ITS FREAKN HUGE!!!

just remember, you will screw up ALOT but dont give up!!! its very rewarding.  if you really want to, you could even fly up to the bridge GOOD LUCK!! post screenshots here