When you're working something of that thickness, it's hard to incorporate a lot of the smaller details when working in slices. A lot of the details are added during the finishing process, be it through some type of smoother, i.e. bondo or spackle, or even engraving the details into the medium that you are building out of. That is why some people build with photographic matboard, simply because it accepts engraving better than what cardboard does. Help a little more?