Now I am going to cut the birch plywood out into parts in meter scale. Just before doing that, one of my friend commented me that I may better to increase the depth a little bit of 10~15mm to compensate the internal volume reduction with introduction of the bracings and stiffners. And Of course there is some increasing effect by the glass wool loading inside. His comment is to ask you whether your plan dimension is already designed and given under all those consideration or slight adjustment should or may be made due to maintain the net internal volume. Would you mind giving me tips for this question?