Is your model compatible with the idea of an exterior one wall ramp on G2 for the first few courses of the lowermost one fifth of the pyramid let's say which were made of the largest stones followed by a lift system for the smaller stones in the upper three to four fifths? Looking at Petrie's course thickness data for G1, I'd say the ramp there on the west wall of G1 stopped at around course 35 the thickest of all thereafter. Could G2 have had such a ramp and where do you think it was? North side?