Brew Your Own (BYO) has a Table Rock Nut Brown Ale recipe that's made available on their web site. I tried it and found it to be the least bit "thin" in body but the taste was good. If I had it to do over again, I think I'd increase any chocolate malt by about 25%.
Paddock Wood suppliers also has a great nut brown ale in kit form. Unfortunately, they don't ship to the U.S. from Canada. However, the owner of the business (Steve) emailed me the ingredients and I tried it...outstanding results. This recipe uses Carafa I.
Best of luck...Ken