Are there more Legs, Heads and Torso parts to customize in the full vesion?
Well technically you can "cheat" to turn yourself into just about any enemy or MP character in the game and use any npc saber hilts, if that counts.
See this thread:
http://www.lucasforums.com/showthread.php?s=&postid=1311367#post1311367) (full version spoilers)
and this one:
http://www.lucasforums.com/showthread.php?s=&postid=1310974#post1310974) (Demo version spoilers)
But yeah, otherwise, no, in the demo what you see is what you get for customization.
Lol, well I found "new" ones.
Im not sure if I just missed it in the demo but in the final the tunic menu has a scroll bar. In the demo I thought there were just 4, ether im blind and didn't notice the scroll bar, or the people that replied are blind and didn't notice it in the release ;)