I'd like to suggest "Linux From Scratch" (http://www.linuxfromscratch.org/lfs/ http://www.linuxfromscratch.org/lfs/) category. It might be easier for beginners,

I'd like to suggest "Linux From Scratch" (http://www.linuxfromscratch.org/lfs/ http://www.linuxfromscratch.org/lfs/) category. It might be easier for beginners, as it has definite start and finish states and instructions. It would be interesting to do a blind run to see how long it takes and later try a "real" speed run to optimize it as much as possible.