I'm a big fan of Firestone Walker Parabola, and I've read some posts from their brewer about the challenge of brewing a big beer like that, and their process, so I've followed their lead.
We will be putting an entire 55lb bag of flaked oats in the mash, this will thicken things up pretty well. We also mash low (144 degrees) in order to help the fermenability of the wort, as this will be quite a monster for the yeast with an OG of somewhere between 1.100 and 1.125 (we've set the goal posts wide here since this will be the first we are brewing this on this scale). To get the gravity up this high we are going to add an entire bag of Muntons dark DME for gravity boost. We'll check gravity near the end of the boil to see if we're in the range, if too low we'll boil longer. I'd like to get the final gravity down in the 1.030 to 1.035 range, if possible. It will be a monster pitch of US-05 dry yeast. This will give us a beer in the 11-13% abv range without being too cloying. We also add the dark malts to the mash for just the last 10-15 minutes of the mash (not the entire mash time) to cut down on astringency.
I think that sums it up. I'll be glad to answer any other questions.
Jon