thanks for making such a great tutorial! it's easy to follow and very helpful. unfortunately i encountered a problem with the shrinkwrap modifier. not quite sure what to do about it here is screenshot http://prntscr.com/b6vkyb
alright i figured it out. it actually quiet simple, since the mode is set by default to nearest surface the meshes have to be inside of each other or it will only warp to the surface.
