I did a multi-keyword Google search for MFZ this afternoon and found a number of related sites.
A Tumblr called Tagged/Mobile-Frame-Zero. Looks like Carbonbass has posted a lot to it.
Here's an article on MFZ with some discussion.
A Pinterest site called Mobile Frame Zero Mech Instructions.
Another Pinterest site called Badass MoF0 Mecha Frames.
A blog post about MFZ on La Cueva Del Lobo.
Another new blog, called MFZ Homebrew Rules, specializing in -- you guessed it -- new rules for MFZ.
Anyone else got any others?