Update:
I have the home page locked down (as seen above) and I have the forum locked down (encrypted with SSL).
However, please note that if you post an image in the forum with "http" instead of "https" it will 'break' the beautiful lock. The rest of the page is still encrypted, but that image isn't so it's not 100% locked down. You can fix this by changing it to https if the image you are linking to supports it.
I'm slowly going through the site file by file (100,000's of files) and fixing them. I tried doing a global search and replace and it rendered the site useless, forcing me to restore a backup one night.
There is a lot involved in this process, but I think it's worth it.
TLDR; When embedding images, use 'https' instead of 'http' if you can.