I really like that you are going to rewrite Vaultwiki into a CMS content type.
One thing to take into account is that vb4's CMS unfortunately is not yet usable for medium to large sites, due to its amount of bugs and performance problems. I would expect this to be resolved around vb4.1
So unless someone provides instructions how to fix up the vb4 CMS performance (like DP did for vb4 forum), medium to big boards, will have to wait for vb 4.1