Pennsylvania Avenue is not a straight line due to the location of the Capitol Building. The avenue is composed of three segments; 1 runs from Georgetown, in the northwest, to the White House, 2 from there to the CB, and 3 from there to the river. If we extend the first segment past the WH, it falls in the same place as the end of segement 3 at the river.
If the CB had been positioned to the south a little bit, the avenue would have been straight from the river in the southeast to Georgetown in the northwest.
Note that, at the location of the White House, Penn and NY Avenues form two sides of the pentagram there, and that their crossing forms 47 degree angles. On the west side of the Capitol, Maryland and Pennsylvania (both in purple) form a 39 dgeree angle, while on the east side they form a 50 degree angle. In both cases, Maryland was drawn symmetrical to whatever the angle of Penn Ave was there.
Moving the CB south would straighten Penn Ave, and if we redraw Maryland symmetrical to that, it would cause the crossing of those two to be identical to the crossing of PA and NYA, a 47 degree angle. This would move the position of Capitol Street and Lincoln Square, but could be done without altering the angles formed by the other set of streets crossing at the CB.
Returning to the elements in Metatron's Cube in relationship to the map, the first figure we see is the pentagram (red), with New Hampshire Ave (yellow) connecting the dots on the west side of that. Note that this line runs to the location of the Arlington House, in the southwest, across the Potomac River. Note also that a straight line connects the AH with the Lincoln Memorial and the center of the ellipse south of the WH.
Another side of the triangle (yellow) is provided by a line that connects two more of the corners on the east side of the pentagon. This line intersects New Hampshire Ave where it crosses 16th Street (the top point of the yellow triangle), and runs southwest of the Capitol. Note that it does not intersect with the CB because that was moved to the north, as shown above. Had the Capitol been located a little bit to the south, this (yellow) line would have passed through the dome of that structure.
Penn Ave and New York Ave form two of the other sides of the pentagon. Extending these provides the diagonals for the larger rectangle of the cube figure, with one corner at the CB and another in Georgetown. Notice that the top line of this rectangle passes through Scott Cirlce on 16th Street, north of the WH.
The smaller rectangle is formed by connecting Washington Circle with Mt Vernon Square (two corners of the pentagon), and dropping horizontal lines from both of those points. Adding a few more lines (blue) completes the hexagon in the map.
Note below that when PA is straightened, and we drop a horizontal line from Mt Vernon Square, it intersects the new Penn Ave line at the National Archives Building.
Another set of (yellow) lines from the top corners of the large rectangle through two corners of the hexagon (or small rectangle) determines the new position for the Jefferson Memorial, based on straightening PA.
This image overlays the shortened version of Metatron's Cube, composed of thirteen ellipses, onto the DC map. At the center we see the White House. Directly above that, at the top point of the hexagon, we see Scott Circle, located at the center of an ellipse. On the right side of the hexagon, we see Mt Vernon Square and the National Archives Building, also at the centers of their respective ellipses. Washington Circle, on the left hand side of the hexagon, occupies the center of an ellipse. The other two corners of the hexagon are occupied by the Navy Medical and Surgical Center and the Washington Monument, both of which are offset from the centers of their ellipses.
Both the Jefferson Memorial and the Capitol Building are locate north of the centers of their ellipses due to the "dog leg" in Pennsylvania Avenue. The corner of the rectangle opposite to the CB is centered in Georgetown. The Scottish Rites House of the Temple (circled in yellow at the top) lies south of the center of the ellipse there, so that a horizontal line there truncates the triangle (pyramid) image. I have yet to discover any kind of monument that coincides with the other two corners of the larger rectangle.