Do you have any detailed information about any structure that might have existed where we see G1's basalt patio today? We are told there was a Mortuary Temple there and that nothing remains from that structure today other than some indication of its foundation in the bedrock, but I haven't been able to locate any report which describes that foundation.
No, I don't, except for the work of Hassan in 1938-39 [gizamedia.rc.fas.harvard.edu].
As I indicated to you in a previous post, the "MT of Khufu" may have been destroyed prior to Herodotus and the other reporters of the later Dynastic era. This structure has no correlation with any other similar edifice on the plateau. Unfortunately, for purposes of further research, it's gone.