After some CSS hackery, I came up with the following display for the FitBit data (Names obscured with red boxes for anonymity). The page is built with ASP.NET, and uses no special plugins (though it has not been tested on anything but chrome, as I am planning on sending it to the TV with Google Cast).
The data is pulled using the method I detailed in the last box, and displayed using basic HTML/CSS. The source code will be uploaded to the GitHub repo when I'm done removing our usernames and passwords from it.
This layout is designed for two people with FitBits sleeping on the same bed and sharing a screen. For alternative situations, additional columns can be added or removed relatively easily.