It's still continued, I was just waiting for things to get more stable and for main features to get working.
So it seems the time has come, hopefully I'll build a new RR version soon.
http://forum.xda-developers.com/cro.../port-xperia-z4-framework-sony-stock-t3154772 There are some links in first or second post of zips you can flash for specific builds of specific roms. If you want to use it on a different build, you need to port your framework. There's instructions to do it, and it seems like some are willing to do it for you if you can't.
I've tried a couple of gapps and not working, (fc). Anyone else?Still too early but this is for those who wonna taste some marshmellow.
most other main features are working.
Thanks for Akash Srivastava for testing.