I would not recommend that - if God forbid you have a fire - you just kinda made a bomb.
Unless you properly vent it and or do not keep the lid locker down.
As far as I recall for at leat powner storage most recommendation are wood. Ymmv
One last thing, while I am a huge fan of Memphis BBQ and prefer it overall to any of the rest; the single best BBQ I've ever had was at Aaron Franklin's place in Austin.
Luckily, he has all of his recipes and step-by-step cooking instructions on youtube: