I just finished reading King David's Spaceship, by Jerry Pournelle. It's part of his Future History series, though very far removed from the Codominion era books. Those books ended with a prequel to a galactic empire, though the empire itself is never touched upon except as a history to later books. This one takes place after that empire's fall and the during the rise of a new one.
Anyway, for a title that indicates a plot about building a spaceship, the story itself has little to do with that. It is the ultimate goal, but the bulk of the plot takes place in a medieval environment. That's not to say that I am disappointed, though. Pournelle writes plenty of military science fiction and he's good at it, even when the 'military' part is with early medieval technology. No, instead of disappointed I was merely surprised at where the focus ended up.