I know this has been done before, but now that Roots is on version 7.0.0, I wanted to use it for my next project, but with Foundation instead of Bootstrap. I started a fork off the new release:
https://github.com/mAAdhaTTah/roots-foundation
I think I got most of it, but I think the comments form could use some work. There are a lot of presentation classes that have to be converted to make it work right.
Let me know what you think.