I have no S90X based devices, I can't test anything, so I'm not planning to build the distro for this device.
I have built a repo that will build successfully for pi 2/3/3+ as well as s905 devices (LibreELEC 9, Kodi 18). The goal of my repo is to keep everything as close to stock LibreELEC as possible, only including changes needed to get emulationstation, retroarch, and the various cores working properly. I have borrowed from 5schatten, escalade, and niabi projects in addition to make my own modifications.
I won't be providing any completed builds but I did just push my latest commits to my github:
https://github.com/jaykass/libreelec
edit:
I also only have included retroarch cores that I use so the core select is very limited on my build.