I have a document at (http://desktopweb.codeplex.com/releases/view/70858#DownloadId=269599) that discusses more about integrating Windows Workflow into Office Add-ins.
The source code is located at http://desktopweb.codeplex.com/SourceControl/changeset/changes/9363.
Please note that an Access version is currently not included in the source code. Please let me know if an Access version would help you.
I prefer to put the documents into my codeplex.com project since it is much faster to authoring in Word and simply upload the document.
Here are a few screenshots from the source code.