vmlinuz and initrd.img are missing for i386. Probably caused by this:

{{{
yum.YumBase.CRITICAL: installing package hdparm-9.43-5.fc20.i686 needs 1446MB on the / filesystem
yum.YumBase.CRITICAL: installing package ethtool-2:3.10-2.fc20.i686 needs 1446MB on the / filesystem
pylorax.ltmpl.ERROR: template command error in runtime-install.tmpl:
pylorax.ltmpl.ERROR: run_pkg_transaction
pylorax.ltmpl.ERROR: YumRPMTransError: Could not run transaction.
pylorax.ltmpl.DEBUG: Traceback (most recent call last):
pylorax.ltmpl.DEBUG: File "/usr/lib/python2.7/site-packages/pylorax/ltmpl.py", line 488, in run_pkg_transaction
pylorax.ltmpl.DEBUG: rpmDisplay=LoraxRpmCallback())
pylorax.ltmpl.DEBUG: File "/usr/lib/python2.7/site-packages/yum/init.py", line 6377, in processTransaction
pylorax.ltmpl.DEBUG: self._doTransaction(callback,display=rpmDisplay)
pylorax.ltmpl.DEBUG: File "/usr/lib/python2.7/site-packages/yum/init.py", line 6489, in _doTransaction
pylorax.ltmpl.DEBUG: self.runTransaction( cb=cb )
pylorax.ltmpl.DEBUG: File "/usr/lib/python2.7/site-packages/yum/init.py", line 1830, in runTransaction
pylorax.ltmpl.DEBUG: errors=errors)
pylorax.ltmpl.DEBUG: YumRPMTransError: Could not run transaction.
}}}
http://koji.fedoraproject.org/mash/branched-20130826/logs/i386.log

The template needs more disk space configured.