One thing that occurred to me, that would be good... Is a downloadable DVD image for fans to burn, just containing the making-of/interviews that aren't included on the proper DVD/Blu Ray.
I'd love to have had a bash at writing the novelisation for Outlander, and included all the deleted stuff. (I'm sort of a struggling SF writer myself
!)
As for a book about the production/making-of, something could be put together and sold through places like Lulu, that print-off on demand?(Or short print runs) Heck, I'd be willing to put that together
! I mean, okay, it might not sell hugely, but it'd be a nice extra for fans to be able to get hold of. There must be a wealth of production design work that could go into something like that, from all the spaceship and creature designs, to the Viking village and clothing and weapons, and construction of the sets, etc.