That seems like it will work, I was going to suggest using a black garbage bag just like someone else suggested a few posts up. You're main focus should be making sure there's not a drop of light in there, and that its dry but not TO DRY in the box. As long as you focus on those 2 things, you will be fine. Post some pictures when you have everything set up, and when the final product is done with please, im pretty curious as to how it works out for you.