Thanks for that, i used your Al Nilam point diagram and over laid it on the Google Earth image, time stamp 2/2013. Approximately Your Al Nilam point is off center from G2's present position by 84 ft in an East West direction and some 30 ft in a North South direction.
That's quite a big mistake .(assuming there was one )
I guess im going to hold on to the pyramids present positions as the ones intended, mainly due to my own particular Giza Clock theory that i pointed out here [grahamhancock.com] to which i do also suggest G2 went through a change of location as seen by the two entrances .
Will any of us be vindicated on our pet hypothesis , probably not, but its fun trying to get there.