I found an interesting interview regarding the making of the new films and the difficulties involved. Worth a look.
http://www.animeuknews.net/article/101/berserk-q&a-with-naoyuki-onda-and-fuko-noda
http://www.animeuknews.net/article/101/berserk-q&a-with-naoyuki-onda-and-fuko-noda