Using:
TellMeWhen - to track player buffs and enemy burst/setup cool downs
OmniCC - to show on icon cool down timers
Gladius (hidden in screenshot) - to manage enemy arena frames with trinket cool down icon and dispel cool down icon
Lorti UI - for the black backdrop in interface
Interrupt Bar - to track enemy interrupt cool downs
LoseControl - to display current player CC
I wanted to use the default arena frames moved to near my cast bar (under the character) but the only addon I found that would reliably move the frames didn't let you position them horizontally.
Interrupt Bar and TellMeWhen icons are set to hidden unless used, in which case it shows with time remaining on the cool down shown on the icon.