I have just completed a step by step build of the new Bar Mills HO scale model, the REA Depot.  There are about 60 photos showing how I built the kit.  This way a great kit to build as everything fit perfectly.  Is is based on a model on George Sellios's layout.  To find the build, got to railroad-line.com, got to the Forums and click on Mike Chambers Craftsman Corner.  Then click on Bar Mills HO REA Depot build.  Here are a couple of photos of the finished kit.