Haven't investigated that much so there might be some big catch I'm missing, but I really wish people would stop making custom OSes and just help out an existing project
More charitably, it's faster and a lot less complicated to modify a distro to your liking than trying to get a major distribution to cater to your whims and philosophy and making your version avilable to others gives them the option of easily installing your new features/modifications as is or using what parts they want. That's the joy of of FOSS. Even when the changes are modest, if they are shared and even a little useful then someone else can incorporate them or build off of them.