I know this takes a lot of work, but the last, last (meaning the first) time this was done, it was awesome.

Thanks to IMM staff!

You've definitely hit on the biggest stumbling block. It more or less occupies a large portion of a day for multiple Imms, of which both simple having free time, and being able to coincide and plan it together can be difficult. Not to mention the sheer sparsity of Immstaff to begin with.

It (and other global level quests) are something I think most of the Immstaff enjoys as much as players, it's just the logistics of it. Which on that note, I really should put pen to paper on one of those things sometime.