Im not a big fan of the big back box, cant understand why they got bigger as technology progressed.
I LOVE the old 30's size back boxes and once EM's went into the big wide boxes that stretch beyond the width of the cabinet, i think they lost a certain balance in the design aspect. No need for the great big back box.
heres a thought.... how about having the boards mounted on a panel in the cabinet that tilts forwards for maintenance once the PF is up?