just came across this build, and just wanted to confirm...
according to the vero, it says volume 3 to ground...which maybe should be volume 1 to ground - correct?
also, the orientation of the red LED's on the vero look differently that the orientation on the actual photo of the board...the left most LED on the photo looks like the ground is facing south instead of north (as in the vero layout).
i'm sure it's a typo, and you're right that volume 1 should go to ground, not volume 3. as for the orientation of the LEDs, just like any other clipping diodes, of they are parallel it doesn't matter which one faces which direction as long as they are both in opposite directions. that is unless you want them both in the same orientation.