Hi all, I have some questions about my new red Brinkmann. My first smoke went well, but the heating element ate right through my foil packets of wood chips. From what I understand, a smoker box might be a good idea. 1) Does the material of the smoker box matter? I see cast iron and stainless options. 2) Should the box sit directly on the heating element? 3) Once in place, how much should it be filled with wood chips? How long will a full box smoke? Thanks all I'll be sure to post a QView for my next smoke later this week. Either a butt or some baby backs.