Build failed on my clean machine because destination folders were not being recursively build.  I'm new to powershell so I just added for a few directory create commands and used xcopy for hierarchies of unknown depth.  Build works.
http://blog.netnerds.net/2011/10/powershell-copy-item-recurse-force-does-not-create-directories-when-using-get-childitem-include/
http://stackoverflow.com/questions/5432290/how-to-use-powershell-copy-item-and-keep-structure