I've completed the SFOS 4.0.1.48 build for the hammerhead. The download link is available in my signature. (Bad news, apps cannot be installed on AD anymore. If anyone would like to help out, let me know and I'll post the instruction on how to start AD itself.)

A little extra work/investigation is still required to make the freshly introduced sailjal (firejail) support more efficient, but in general, it works fine in the current build.
Any issues and/or questions, please let me know.