Just one small thing I noticed:
In order to make the symbolic link, relative paths don’t seem to work. Easiest for this is when you’re in Terminal, go to the dosdevices folder, and use this command (change the number for usbmodem)
When your cursor is at $PWD and you press the TAB key, it will fill the full path.
The instructions supplied here are very useful to run u-Center on Mac OSX: