This sounds fantastic, where can I get such a gig? There's really nothing better than being given a more-or-less defined task, and being free to just go get shit done, without interruptions, or waffling, or hemming and hawing about whether it should be done this way or that way, by people who have no understanding of the technical realities.
Thank god it's a work-from-home Friday. I predict I will get far more accomplished in four hours today than I did in the 40+ I was in the office Monday-Thursday.