meh... you do realize every 2-guitarist heavy metal band in the world has pulled off stuff like that decently for fucking decades
ask judas priest or iron maiden (pre 2000) fans if they think it sounds like shit when they leave out the rhythm guitar for harmony parts... that's why you have a bass guitar you know!
and yeah, 7 layers, sure, but that's probably two identical layers for each rhythm guitar, left and right = 4 tracks (and these likely play the same thing anyway), and then maybe a three-part harmony or one lead dubbed + harmony