Heat actually does support loading multiple files, with the additional ones included under the "files" key in the API: http://developer.openstack.org/api-re...

The Heat client will automatically include any files referenced in the template in this section when you create/update the stack. So if you're using the CLI client then it is probably doing this already with the files from your webserver, and nothing would change if you just changed them to local (file:///) URLs.