Wont be able to give you a screenshot of my HUD but since i started playing melee where i find the key arrangements are necessary.

My concept of keys are like this:

[1-2-3]-4-5
Your most pressed buttons or combo actions in sequence.
[TTT] (123 Thrust) - Plebo - Leg Sweep.

(CTRL+) [1-2-3]-4-5
Your 2nd set of combos in sequence.
[IDC] (IDrive, Dbowel, CThrust) - H.Thrust - AOE

(SHIFT+) [1-2-3]-4-5
Weaving Skills. (Skills that slot in between GCDs)
JUMPS - Mantra - Mercy Stroke

Q - Talon (Button easily pressed when running away AOE. DPS golden ABC (Always be Casting)
E - Invigorate. Convenience Button to top up TP which dragoons always does

F1 - F4
Other GCD skills that you rarely use. I usually put up other CC skills here that is used once in a while. Eg. 2nd Wind

ZXCV
My Offensive Cooldowns
I. Release - BfB - Life Surge - Power Surge

I use this set up to easily press on every button using my left hand while my right just manuevere my camera and my character's vision.

Oh, on top of that i added a horizontal bar above my HP to keep track of Cooldowns. If you need my HUD i can show it you.