I also work with a symlink from my "normal" home directory to my scratchbox home directory. Is scratchbox installed in your root directory, you can create it like this:

cd <to your home directory>
ln -s /scratchbox/users/<your user name>/home/<your user name>/ scratchbox_home

Now you have a "directory" called scratchbox_home in your home directory. So you can easily access the files inside your scratchbox home director from your Linux system.