There are a few options the lab driver isnt that great used on its own. Try looking here for a design utilising the lab http://photofile.ru/default/do.php?id=3426459#sm There is also the punisher for a 12" ciare driver http://www.iven.nl/kastontwerpen/punisher.htm
Other than that the Tuba 30 on bills forum is for a 12" not the lab driver tho!