This is a really neat puzzle. Fantastic piecemeal puzzlework combined with a really interesting design and neat usage of the exterior to prevent core abuse.
I hope this 578 sticks! The 580 was really solid but there was a suspicious amount of wiggle room still in the puzzle that I was really hoping to eliminate.
Sir Qwerto pushed this a bit lower and made me fight to find 4 more. Found 6 but man are there a lot of little quirky things to check!
There's a spot here for a really classy 2 cut that gets impeded with a return path that's a bit unfortunate but otherwise a great usage of the left right burger block!