One thing to be careful of is the rotation of the vertical monitor.
I have a vertical cab for my PCB collection with the monitor turned clockwise (left hand side at the top) to play time pilot, bomb jack, star force, pengo etc...
When I tried my jap dreamcast in the cab to play ikaruga, it expected the monitor to be rotated anti-clockwise, so I'll need to setup a yoke flip (unless someone knows a better way) as I can't rotate this monitor its fixed in its current vertical orientation. My Donkey Kong Jr PCB expects this orientation as well so I will need to come up with some solution to this.
I've attached an image to illustrate this.