I haven’t really had experience dealing with DHF documents but in the past we have kept all our important documents in SharePoint and that has been very helpful. It provided us a place to upload and make the latest documents available to rest of the group. I think if DHF document is maintained by the project manager then it would be up-to-date with the his information. We had also hired another audit company who asked us for the financial records time to time to make sure we are on the track, perhaps this task can also be performed with DHF files.