I checked out the google book. Doesn't really seem like a recipe that would lend itself to being sour. Need to hammer down a brew date, though.
FYI, The following dates are potential brew-dates for me (and maybe the club?) Jan 26, Feb 9, March 2, 9, May 4th, or May 25-Jun1. That's when the house is empty. I'm probably going to try 60 gallons of Lambic May 4th - with an authentic 2-day mashing schedule.
Chugach Brewing Co.
One fine beer at a time.