He wants to create real instruments sounding as realistic as possible using his production techniques. Think that this will be a good pack to have for anyone looking for more expressive real instruments. So before releasing his new Builderz pack there is a video to get an idea of what it all means soundwise.
To read more about the builderz projects for Caustic go here: http://www.musicalandroid.com/1/post/2013/06/caustic-warrior-jblann-talks-about-caustic-and-builderz-packs.html
Caustic 3
Here is a Demo pack for Caustic 3 of his latest creations ( but physical modelling not yet... ):
Caustic 3 Big Demo Pack 1