User blog comment:B214/Question and Answers/@comment-79.53.173.229-20130906091749/@comment-16607220-20130906094638

The animators have to recreate their own designs especially with some of the weapons and characters. Ascalon was only shown in one picture in the LN and there isn't enough sources for the animators to base at but with imagination. They also have to redesign a lot of things like the Scailmail designs since we don't have a full picture of the armors and it  turned out way better than the I imagined.