RPi-Buildroot is a fork of Buildroot, you can use it to build a customized system for your next embedded project. Just be sure to be familiar with Buildroot itself and how cross-compilation works.
Build a trimmed down, fast custom Linux distro for your next Raspberry Pi project.
Is this still active?
Maybe you could share the development in it's current state even if it's not finished... to help other people to boost their projects.