I can also tell you if you complete it you still got access.
Me and some friends completed it while breaking weapon latents (the ws ones) and I still got access though the back door, tho I could do it again since it's repeatable. We didn't care about drop rates at the time, the thing was breaking the latents on the weapons (Which I recommend anyone who actually wants to complete the quest save that for. Makes it more palatable if you combine it with WSNM weapon breaking and you'll be singing a slightly different tune then since the shells will be more of a bonus.)
Mind that was at 75 so you may have to gimp your gear a bit to get a sc off, but YRMV.
Elizara, Mithran WHM of Quetzalcoatl
LS's: SpecialFriends, ShikigamiWeapon, Noble's, WeSayHurray, JingZen, Betrayed (Dynamis and Aby)
Still a MithraPride kitty at heart, tho that shell is gone..Also still CTY at heart forevah!
Midgard: NEVER FORGET.
Alla profile: http://ffxi.allakhazam.com/profile.xml?11530
Thinking about swapping from console to PC? Check here to do it right!