I loaned out my book, and it was never returned. I tried looking for my modifications on it, but they are gone too.
I do remember the third, third, third part. I wasn't as fond of Caramunich, so I am pretty sure I used Crystal 40, and probably 1/2 lb for 5 gallons. I would have added 1/2 lb of wheat to mine (5 gallons) too as I use it for head retention. I know I used S-04, and I am not a big fan of Hallertau, so I probably used either Saaz or Cascade, but probably very little since I was making a spice beer.
A true Oktoberfest/Marzen is going to be a lager, so I think you are trying to do something different, but fallish.
If you actually want to make a pumpkin beer, take the above, get 5 pounds of fresh pumpkin, bake them for an hour or 90 minutes at 325 or 350, add a little brown sugar when you scoop the skin off, take your pulp, put it in the blender with some spring water, get it into liquid form, and add it to your strike water. Use spices very sparingly, ESPECIALLY allspice, and replace some of your hops with spices like cinnamon and nutmeg, again VERY sparingly.