I actually just saw something about that Jesus nut come across my FB the other day. I follow a bunch of aviation pages on there. It's mind boggling to think that the whole mess is held on with one nut.
We've used the multipliers on some bolt ups I've done in the past. Our multiplier was made by CAT and the torque wrench they use on those is about 4' long.
I would hope the Jesus nut on a helicopter I'm in was definately good and tight haha.