I am having trouble with steps 69 to 73 of this model. I can't seem to get the bottom bits of the model to all sit in a strait line as is shown in the picture. I can finish step 70 but when I try to do step 71 I don't seem to get the same as the diagram. If anyone has any tips or help from when they folded it I would really appreciate it!!

The diagrams are in the VOG 2 book

Thanks!