Hi Robin,
I have not been able to find coordinates, the Giza Plateau Mapping Project states, "The underlying data for the Giza Plateau model are not available to the public at this time. When the basic model is finished we will determine how and to whom the model will be made available."
As to its positioning to the NW, likewise l have no data of azimuths and levels, that Petrie would often provide. We can only guess at the landscape before its construction, the more deeply quarried quadrants to the south and west of the structure, may have dictated its orientstion, likewise the sizeable wadi to the south.
Theres lots of data l would like to get my hands on, like the 3D survey data; but this is not available to the public, even if you have the expensive processing software to view such data.
The guide is far from exhaustive on this structure, still many blanks to fill in, pending more data that will hopefully be released in the future. So its time to move on to my next guide.