Radian - is a source-based distro, with rad used as package manager and dinit used as init by default
To install it, firstly compile LFS by sysvinit guide, but install dinit. Then, install rad dependencies and the rad of course, Then install packages with rad. That's all. To see how to configure and use rad you can here
If you don't want to install LFS, you can do it another way. Get a stage-3 of radian. But is be able in future, sorry, so one way now is do it by script or by your hands. Experimental routine