Register of primary diagonal for each pitch . . .

Okay, here's the main diagonal I envision for each pitch on the guitar:

A4 and A3 (both diagonals necessary)
A#4 and A#3 (ditto)
Bb#4 and Bb3
B3
C4
C#4/Db4
D4
D#4/Eb4
E4
F4
F#4/Gb4
G4
G#4/Ab4

That makes the middle C octave the octave of choice for each diagonal on the guitar, with the exception of the A#, A, Bb, and B diagonals.

That means the guitar is, primarily, a middle-range instrument. Lower sounds and higher sounds are like special effects.

#4 Drills to tighten things up . . .

Wow, seeing the diagonals makes things soooooooo much easier. I don't get lost moving my way around the fretboard, I can slide inside and outside of different shapes and I know exactly where I am on a piano keyboard. I still hit some wrong notes, though. Here's some stuff I'm gonna do to tighten things up:

1) visualize all box shapes in my head, starting with just the top octave of each shape. Will do this for major and minor pentatonic right now. My first goal is to tighten up playing "on top" of the diagonal.

2) practice horizontal sliding scales in each key. This involves spelling the scale in my head and then play it sliding to the left, or down starting at each root located on the diagonal.

An "a-ha" moment!

Yay! My work on diagonals is paying off. I saw a grand diagonal of E4s all the way across the fretboard from string 1 to string 6. That was exciting because it was a moment of complete peripheral vision: in other words, I can see where a particular scale is in every place it happens all over the fretboard in one glance. That has never happened before . . .