Somewhere around here there's a link to a step by step guide to doing this. However, I doubt that it will be supported by anybody, in any way. And (just in case) you should look up to the top of this forum, where there's an announcement warning Vail
users that Vail is not supported in a production environment. The Known Issues list (look up for that too) should make it clear that it's not fully stable yet...I'm not on the WHS team, I just post a lot. :)