Hello I am a noob here but I flashed an SD card with your latest build Rpi4, played around works really darn good too. Had some issues changing skins, resulted in losing emulation station and retroarch selections on the main screen. I also noticed that upon removing main screen menu options on the original skin "Estuary", reboot brought them back. Also couldn't add media to their respective menu options "tv show" / "movies".
I'd ideally like to work on some of this stuff myself and im going to look around the forums for faq's about building my own, I would like to maybe work with you on your project because it seems like you're headed in the right direction and very close to what I am looking for.
Thanks for you work so far.