I would like to build something like that someday. I got plenty of cookers and smokers for BBQ but you can't beat a smokhouse for home processing. Curious about your smoke and heat source and temp control?
Here's my build thread. I think the pictures in it will answer most of your questions. Let me know if it doesn't and I'll answer and help as best I can.
http://www.rokslide.com/forums/cooking-in-the-wild/70028-smokehouse.html