It Seems lke the pipe going to the bottom of your smoker will be in the way when you try to move it using the wheels. I would move the wheels on the other side of the drum. It also seems like your intake is "poking" through your ash-catch plate. If that is the case, there might be a problem with the ash clogging your intake. Edit: I would put a cone of sorts on top of the intake instead of simple plate on the basket.
Simple does not make it better. It just makes it simple. There is always room for improvement.