Some improved X-ray diffraction techniques applied to the two 3rd stage metal bromide graphite intercalation compounds with CdBr2 and CoBr2 should give some more detailed structure informations. However only few more informations have been obtained from precession photographs and high resolution powder diffraction on the two GICs. Measuring several flakes on an automatic four circle diffractometer did not yield additional informations. Some attempts to solve the structure by Rietveld-Methodes using the powder diffraction intentisities failed. Using the few available informations, an idealized model for a 3rd stage GIC is proposed. On the basis of this model some observations are discussed.