@Tirick:
i used corrugated cardboard between the layers. but i pressed it together
between two telefonbooks over night. sorry i did not made a detail picture of it, so you can not see it clearly. the other layers are made of card from "cornflakes" boxes. or pizzaboxes , i can not remember.
@silveroxide:
the pod will be closed. that here is a testbuild, just wanted to know where the problems are. yes , i will made a strip of paper around the edges. see later pictures. no coloring will be done. i will keep it blank.