We need to build all actions that are required to complete the jigdo into callbacks for the primary objects. Those being slices, isos, templates, etc. All of these objects need to be generated from the first jigdofile object. Callbacks like jigdo_file.get_templates() -> jigdo_file.verify_templates() -> jigdo_file.init_templates(); template_def.gen_slices() -> template_def.download_slices(); etc. Everything will need to be called from the main loop (the twisted reactor).