The Chicago Diner's recipe for their Radical Reuben (including the corned seitan and Russian dressing) can be found over on the bottom of this page from Vegetarian Times.
We used some vegan rye from our local bakery and Daiya Swiss slices to put together these amazing sandwiches. While the bread was toasting, I would heat up the seitan in a pan and let the swiss melt over the top. Assembly was easy, just use a spatula to deposit the melty seitan and cheeze onto the rye. Then add some dressing, chopped fresh cabbage and/or sauerkraut.
The delicious Radical Reuben
The time investment is worth it, go make same seitan and enjoy your own Reuben or head to the diner if you are in Chicago. We just got back from visiting a friend in the Windy City, so I'll post some pictures of our meals at the Chicago Diner soon.