This may sound silly... but could I use a Pro-Q WSM stacker with a Weber 18" kettle to make a poor man's WSM?
Pro-Q: http://www.ebay.com/itm/PRO-Q-BBQ-P...432?pt=LH_DefaultDomain_0&hash=item43ad0a68f8
Pro-Q: http://www.ebay.com/itm/PRO-Q-BBQ-P...432?pt=LH_DefaultDomain_0&hash=item43ad0a68f8