With roughly three hours bulk fermentation (incorporating three sets of folds) and just over a couple of hours rest after shaping (both at room temperature) this is a comparatively rapid process for a sourdough. This could be elongated by fermenting at a cooler temperature but I would only choose to do this for convenience reasons rather than in search of flavour, as this is already amply provided by the mix of prefermented flours.
Although fermentation time for the overall dough is comparatively short and hydration at 68% is not that high it still resulted in a soft, open crumb structure. Next time I think I will bake for slightly longer to get a darker, more burnished crust.