>>1142374>>1142408>downtube cable stops upside downThe reason for this is that they're the old style Shimano stops where one of the adjusters is a lever adjuster, the other is a barrel adjuster. Given the choice I think it makes more sense to use the barrel adjuster for the rear mech.
And on most bikes, you'd need to have the stops the other way around, but on this frame it makes no difference whatsoever because the cable guides are located above the BB shell.