I have updated the merged 4.17 build with the addition of Volumetric Lightning:
https://github/MaximeDup/UnrealE…17.X-GameWorks
In the video below i’m playing with the updated HBAO and mixing VXGI/Volumetric light in the Museum demo scene from Vol.Light Samples.
The setup of the Museum is similar to the one i did back on 4.14.3 a while back.
The updated HBAO is !
v=097CbR1Dk6w
You can download a packaged development build of Museum Scene on link:
https://drive.google/open?id=0B1…mNkVlJpMHViMHc
It’ll allow you to play with all the parameters using the console, testing the performance etc… 
HBAO seems to be disabled by default, you’ll have to use r.HBAO.Enable 1 to activate it.