Yep, I did it in 4 casts. Two weeks of reading and prepping, locations mapped, times figured out when to play... costumes, disguises, and potions on hand... empty bags to go...
Sunday night at 1:30ish am (technically monday) Took the front door in, used Orb of Deception on a Brewfest Ram to try to fool people. Guards were more of a pain. A DK and Rogue jumped me almost to the pool/cavern area.
Ran back, watched around my body, coast was clear, ran over to the wall, healed, did a /sleep to test it out, threw out 4 casts and...
http://i42.tinypic.com/21b9j0g.jpg
(excuse guild chat cursing and miscounting, I was freakin out)
Not sure how solid the proof is, but time is shown, my orb of deception cooldown is just barely gone, only 3 fish in pack (you can see my dead skely in distance).
To anyone saying I was lucky, its true, but I also finished my entire fishing achievement tree up that day and got "Salty". I already had the Old Crafty from a few days of fishing a couple weeks earlier, and about 4 days in Mulgore getting a fish for the other rare. The rest just came. Not to mention 2 years of fishing contest to win... luckily I was first on my server after I transferfed from Bloodhoof to Area 52 the week it opened during BC release week.
Now just see me in my full getup sitting in my fishing chair in Dal somtimes. Good times and Good Luck.