I must need some Red Bull or at least a Dewalt impact wrench - I work sooo much slower! I envy your collection of needle nose plyers. I usually use some curse words to speed up my work, like "Scheisse"! I fretted with a protractor, marking original position and a level when I lowered the rear of mine. How do you know you know you have one notch? Were there no front beam adjusters present? Great job and video!
Looks like a good build - rear sag was nicely addressed by PO with added welded in brace.
A larger steering wheel would solve the not being able to view the gauge issue - appears to be a 14" one on it now.