When Rhino released "Beat the Boots" - a collection of Frank Zappa bootlegs, I felt it was pure genius. I remember reading an interview where Zappa admitted that he wasn't happy with the sound quality on most of the recordings, but he felt the release was a way to beat the bootleggers at their own game!
I believe the Zappa box consisted of 10 full length LPs. A box ten times that size could easily be done for Zeppelin, with only the very best recordings. And if it was an official release, I would buy it.
In this day and age of internet trading lists, and lossless FLAC files being swap