I brewed this twice.
Once was the original recipe, and then again a month ago.
On the second brew I replaced 2lbs of the Maris with 2lb or rye malt, the flaked oats with flaked rye, and the williamette with Norther Brewer.
Both turned out delightful. Thanks Yoop!
I recommend anyone that likes rye beers to brew the rye stout version. It is great!