Dude, guess what? THE FULL VERSION OF SKYWARD SWORD IS ONLINE! Here's a link: CLICKY
If you don't have it already, get uTorrent, download the torrent version of the game, open it up in uTorrent, let uTorrent convert the game into .rar files, open up the .rar files in WBFS Manager, put 'em on the USB drive, and TA-DA!