Mash at 154 °F (68 °C). Boil for 60 minutes. Ferment with neutral ale yeast at 75 °F (24 °C), then rack to barrel and add sour blend. Aging time is totally up to the barrel. This is where years of tasting and blending come in handy. If you want to blend, try ~ 20% of a sweeter (younger) barrel, ~30% of a nice mild sour barrel and ~50% of a well established “tour gripper” with nice oak notes (cherries, horse blanket, etc). (Young usually means ~ 1 year, mid range ~2 years and grippers are 3+ years.) But there are no rules here. Do whatever works for you.
Don’t have the budget (or room) for a barrel? Try this “poor man’s” method of emulating some of the aspects of barrel aging. Conduct your primary fermentation in a bucket or ferment the beer with ale yeast, then rack it to a bucket — adding any “bugs” that may be called for. Buckets are more permeable to oxygen than barrels are, so let the beer condition in the bucket for only about 3 months, then rack it to a carboy for the remaining conditioning time. Two weeks before racking, take 3.0 oz. (85 g) of oak cubes (French oak, medium toast) and soak them in wine. Use Chardonnay for the Temptation clone, Pinot Noir for La Roja, Cabernet Sauvignon for Darth Porter and Burgundy or Meritage for Grand Cru and La Folie. Change wine every 3 days to lessen the intensity of the new oak. Add cubes when beer is racked to carboy.