Neat article about how some folks that live off grid made their own root cellar and smoker.
Country Side Magazine always has such good information.
Build a homestead root cellar and smoker
The Complete Root Cellar Book: Building Plans, Uses and 100 Recipes
The Complete Guide to Your New Root Cellar: How to Build an Underground Root Cellar and Use It for Natural Storage of Fruits and Vegetables (Back-To-Basics)
Build a Smokehouse: Storey Country Wisdom Bulletin A-81
Countryside & Small Stock Journal