There are ways to get some cable slack if you need it. Here are some suggestions:
(1) the rear brake cable runs through two cable anchors brazed to the top tube. If there is a split in the brazed-on anchor, you can squeeze the brake calipers together and use the slack to remove the cable from the braze-on.
(2) you can remove the front brake caliper from the fork. Just pad the brake well as you pack it.
(3) maybe remove the computer mount on the hb
(3) if you are going to ship your bike frequently, get cable splitters installed (see
http://www.sandsmachine.com/ac_cable.htm) on the rear brake and both derailleur cables. Then you just unscrew the connectors and you've got about 2 ft extra cable slack.