I agree with KnifeBld's comments.
Half fill your bowl with sand, Then make a half bowl out of it covered with foil to catch the drippings. Do what you can to seal that bad boy up. Errant drafts and leaks in a smoker makes keeping constant temperatures a real challenge. You are more likely to keep a hobby if it is less of a fuss to do it. Possibly an upgraded smoker may be in your future. With the end of summer sales going on, now would be the ideal time to buy. Invest in a Maverick ET-733, it will probably be the one consistent tool you use as you change your smoker over the years. Consider purchasing the 6 foot probes for it; it will give you more options on how you run your wires.