For servers with the AT ArenaSpectator, I developed our own addon, ArenaFrames, which looks like the default targetframes, including trinket timers. It is built in fashion of the original default UI frames of WoW 3.3.5 and has serverside supported castbars and buffs for all units. It also allows you to use keybinds to target and focus your enemies. You can move frames around, disable clicks, lock them and manage the amount of buff/debuffs you want to show.
It has an ingame menu that you can open with /aframes and you can show the frames to configure them by using /showaf.
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