I got a 500 gallon propane tank and am going to try and build my first smoker with firebox. My first question is this. I see alot of these tank smokers have a plate on the bottom inside, I guess reverse flow? How does this work? How does the plate have to be placed, size? And this is placed just above the opening from the firebox? I was also wondering How come most tank smokers I see dont have any damper control on the hole between the firebox and cooking chamber, They are normaly just open holes. Would it be better to have a control/damper, like a plate thats controlled by a rod? Also does anyone have a step by step thing I can look at? Last but not least, where do I get the High gloss heat paint I've seen on the pits on that show BBQ Pitmasters that Jambo pits makes???