no cure I'm afraid - and, from my experience, custom builders are (probably rightly) notoriously known for 'under' estimating delivery times! Both my GBs were originally quoted as 2/3 month builds - the first took 10, the second was a couple of weeks short of a year (a previous build from John Diggins also suffered the same delay) - but they are definately worth the wait!!!
Cheers
Dave