sugar-build is a set of scripts to build sugar from sources. Please read the documentation.
Before submitting changes to the config please run json-format on the json files you modified. The script is available in the shell.
If you need to make changes to osbuild, you can clone the module
git clone git://github.com/dnarvaez/osbuild.git
Install it for your user
python setup.py install --user
Then remove the sandbox so that it's built using the installed osbuild
rm -rf build/out/sandbox