Hi,
I just released the first version of my Sass (SCSS) boilerplate base on:
- CSS variables
- CSS grid layout grid with fallback to flexbox (If you want the grid only => https://codepen.io/vinceumo/pen/ZrMKYb)
- KSS live documentation
- Atomic Design methodology
If you want to try it out or to contribute to this project here is the link to the repo 
https://github.com/vinceumo/atomic-bulldog
If you like this project don’t forget to give it a start on Github 