No sass files?
I've moved on from using reverie as a foundation based wordpress theme since it wasn't being updated for a year. I came across your theme and I must say it looks very nice but when I download it I see there is no sass files at all from foundation? Maybe it would be a good idea to add them to the package, just suggesting.
Did you have a look on child theme ? I used this in my fork of cornerstone
The SASS files wouldn't be useful in this repository because it is meant to be used as a parent theme, not edited directly. You can check out regdoug/wp-players-theme if you want to see an example of how you might develop a child theme using the Foundation SASS files.