Well..
You do not need ZBrush to do this. The traditional manner is very usable. Sculpt the details in any modelling program and export both high and
low poly meshes to a Dot3 bump generator. NVidia's Melody, ATI's NormalMapper and XNormal are good examples.
There is an other method. Very strange, but I some people who like it. In Blender, you can paint directly to a mesh. You start with a black image and use white brushes to paint the bump map. Use the same image in an offset modifier and see the result in real time. Of course you will need to paint to a
high poly mesh to preview the result accurately. The you can convert that grey scale image to Dot3 bump. ATI's tool can do that, if I recall correctly. Even Blender has a new normal map node that performs the conversion (I did not check if it is already implemented or just planned). Anyway, you can do the painting in any program and convert the greyscale to Dot3 bump. I do not recommend this method, but some people like it.
By the way, you are doing a good work on that pack.
I just think you need to show bright renders and, of course, update it more.
Ps.: forgive spelling mistakes. My spell checker stopped working.
