I have that same smoker. Works pretty well, but you have to keep adding wood chips and make sure they are close enough to the electric element to combust / produce smoke. Haven't ever gotten a "smoke ring", even when a few pieces of charcoal were added.
You can also create wood chip "bundles" by placing them in a piece of aluminum foil with an opening at the top.
You may want to consider adding reflectix insulation (clothes pins holding it) and electronic temperature control. I bought the reflectix cut to order @ Ace Hardware. Here is a picture of mine in action.