My Own Ideas
The ideas about the DC map that I characterize as 'my own' can be divided into two groups, one dealing primarily with the cross-section of the Great Pyramid and the other dealing with Metatron's Cube and the Tree of Life. I will begin here with the former.
The Pyramid Cross-section and the DC Map
[Note that the right side of this triangle, running from where New Hampshire crosses 16th Street through the two right points of the pentagram, is not represented by a street in the map; also, any east-west street forms a base for the triangle, and two horizontal lines produce the image of a 'truncated' pyramid like we see on the back of a One Dollar Bill.]
The elements of the Great Pyramid as represented in the DC map layout
The Wash Mmt and the Queen's Chamber
The Washington Monument is located 371 feet east of the 16th Street axis centered on the WH (as you can see in the image above) and also 123 feet south of the E-W axis through the CB; that is, it is 'offset' in two planes.
Looking closely at the pyramid image we see that not only is the QC offset to the north of the KC (right in the west facing view), but that there is a two foot step down (offset) in the passage leading to the QC; that is, the QC is also offset in two planes.
The 'official' story about the Wash Mmt is that L'Enfant had planned for there to be a life-sized equestrian statue of Pres Washington located directly south of the WH and directly west of the CB, but that when the time came for the monument to be built, both the location and the design were altered. What we now see is an Egyptian Obelisk offset from this axial center of the city. [Note that much of the effort of the McMillan Plan in 1901 was aimed at reforming this asymmetry in the map.]
Below we see a section taken from the March 1792 Ellicott map of the Capital City, showing the proposed location of the statue. Virginia Ave radiates from there in two directions; to the northwest toward Georgetown and to the southeast toward the East Branch of the Potomac. [Note that the southeast section parallels the segment of Penn Avenue between the CB and WH, which forms a 19+ degree angle with the horizontal.]
When the Wash Mmt was finally built, the 'new' location was chosen so that it still fell on Va Ave (as seen from the E. Branch of the river). The view from Georgetown no longer works. [Note that the view from Georgetown was not focused on the monument area in L'Enfant's first draft of the map.] As you can see below, since the Wash Mmt is south of the E-W line through the CB, the blue line from the CB to the Lincoln Mml is running 'downhill' about one degree.
If L'Enfant was the author of the idea about depicting the pyramid in the map layout, then the story about the equestrian statue would appear to have been a subtrefuge, a fib; unless, of course, he intended to depict the Wash Mmt as the QC w/out offsetting it, and someone else did that later. The 1792 plan clearly shows both sections of Va Ave pointing to the central location.
My Idea at this point is that 1)the DC map was intended to incorporate a representation of the cross-section image of the Great Pyramid, and 2) the Wash Mmt was moved south and east of the radial center of the city in order to better depict the Queen's Chamber but the new location was chosen so that it was still in the line of sight of Virginia Ave as seen from the East Branch.