I have a 1947 GE refrigerator that I am wanting to convert to an insulated vertical RF smoker. I want to keep it all stacked and no offset in attempt to keep as much of the original look as possible. The CC is 26" wide, 46.5" tall & 15" deep. The FB would preferably be confined in a 11" tall, 32" wide and 18" deep area. According to the Feldon calc's it will not work (only 72%). Apparently I will have to make my smoker taller. The intake chambers will be around 51" tall and the exhaust will be at least 50" tall. The issue that I am having with the math is that the Feldon's calculator is for an offset smoker so I have no idea what size I need for the fire box, the (2) intake chambers and the exhaust chamber. I am not sure if I can stick with rectangle chambers or it will be better for round. I plan on the chambers to be on the exterior of the back of the fridge so I think rectangle would be easier to make. Any suggestions for my project would be great.