Considering using fourseven:scss but am curious, does it put the compiled css in a certain place by default? I don’t see a setting for that in the documentation https://atmospherejs.com/fourseven/scss.
Its built as a part of the build process and served as a normal css file.
I don’t think you have access to its compiled result as its not cached outside of a build. Spelunking through the build directory might locate it.
If you want to preview a compiled css file you can run the same tools it does: http://sass-lang.com/libsass.
You can also use this tool http://sass.js.org/.
It helped me find a broken character that was breaking the file.