Gday Rhollan, When you say “board and batten” wall i assume you mean FC sheet with a cover molding on the joins?
Or if you mean off stud battens you will find that in the latest update of PlusDesignBuild here plusspec.com/plusdesignbuild/
As far as a texture or material goes you can create your own materials here is some information on this plusspec.com/plusspec-material- … %2FManage’.
Also here is a video on creating materials in PlusSpec which I think will be your easiest way to get what you are looking for youtube.com/watch?v=kKXtLs8JUcM