This was another piece designed during beta testing for ZBrush 4R8. Using Live Booleans & also new Deformer tools in 4R8. Had a lot of fun experimenting with Deformer tools during Beta testing, and found all kinds of new ways to make stuff.
I decided to make a quick breakdown of this process. I hope this is straight forward, but if anyone needs further explanation i'd be happy to post more detailed images :)