Plenty of interfaces mimic a form process. If that's the case, and it's really just a page positional thing (not state), I see no problem making button-based navigation.
We don't scream and shout that page nav links all look like content links, after all. Well, maybe you do, but it's not 1996 any more.
We don't scream and shout that page nav links all look like content links, after all. Well, maybe you do, but it's not 1996 any more.