SCU has the sites created on our SCU Google Sites domain locked down so no one outside can view them. Here's how to work around that:
First, share your site with your personal gmail.
Next, go to your sites.google.com using your personal gmail account, open the shared site, and create a copy.
Give your website whatever name you like (it can be the same) and save it to your Google Drive in your personal Google account.
This will create a Duplicate site in your personal Google account.
Finally, set the sharing settings to share with the whole world, using the Share button in the upper right corner.
Now, the whole world can see your work!