Hey guys, I'm starting my first smoker build and decided to make a reverse flow. I have done an extensive amount of looking around at this site and other ones like it and have selected a cc and trailer. I am working on it with a friend and am making it for a friends family. They are providing materials so I have no cost in it just labor. I have already attached the tank to my trailer but need a little help in understanding how large to make a few things. First I am curious how large to make my fb/cc opening and how large to make the opening under the baffle plate and on the other side. Next, I would like to have recomendations on my exhaust size and height. Lastly, based on my measurments should my firebox be 30x30x23 ?Here are some measurements and calculations I have done already: Inside diameter of tank: 36" Length of tank: 63" Gallons of tank: 265 gallons Volume of cc: 61094 inches cubed Volume of fb: 20161 inches cubed Fb/Cc opening: 244 inches cubed So should my fb/cc opening be 27" long by 6" tall??? Any input is helpful and I plan putting progress and pictures up once I can get back to our schools computars. I will post pictures of the original trailer and progress while cutting apart. Then attachment of the cc to the trailer. Any help is much appreciated, thanks!