I'm assuming you are using the bricks for extra thermal mass? If that is your purpose, it probably won't make much difference which direction you lay them in the chamber. I gather your smoker is thin gauge metal, and you are looking for ways to help it hold temps more steady?
The bricks might help some, but I know from experience that it's a lot of work to keep temps up in a COS (cheap offset smoker). My first smoker was COS that leaked air from everywhere. Hard work to maintain temps...but it can be done with patience and lots of wood and charcoal.
Hope that answers what you were asking...if not, provide a bit more info about what you're trying to accomplish and I'll try again.
Good luck!
Red