I think the time is ripe for this to happen, and for some significant publications to start coming out of the Wikibooks project. I'm even willing to put some of my own money into this endeavor, but I would also like to see if there is any additional interest in those sympathetic to Wikibooks who would like to join me in this effort.
I think you should go for it! This is the whole point of the GFDL! Yay!
I would be willing to do some amount of layout and design work if that's necessary and desired.
Kellen