The owner wrote a book called Extreme Brewing where he published most of his recipes as well as a few other good ones. I know Punkin Ale is in there but I can't remember if it's all grain or extract (book is outside in my car right now). You could get the recipe from there and if it's all grain, use BeerSmith or something similar to convert it to all grain.
I would post the recipe but I'm not sure if there's a forum policy against posting published recipes. I'm pretty sure Sam Calagione wouldn't mind but I'd need clarification from a moderator first.
Edit: I just checked and that recipe uses extract. It looks like all of the recipes in the book are extract, only using grains for steeping. If you can get a hold of it, I'd recommend it.
Reason: checked recipe