Out of curiosity I called Lonnie Smith at Bubba Grills and he told me about the 120 Fat Boy reverse flow. The diameter and steel of the fat boy is the same as their 120 grills.
Cooking surface is 29x28 for the bottom rack and 29x 21 for the top rack, all slide outs for a total cooking area of 9.8 ftsq (slightly more cooking area then the Lange 48) This patio type grill is reverse flow. He will add the firebox grate and alter the propane starter at no charge. I asked them to leave the lifting ring attached to the grill. Weight of the grill is between 500 and 600llbs.
One comment he made has me thinking
"The diameter of the cooking area is important for a better smoke". This is one reason they cut down the 120 (length) instead of just starting with a smaller diameter tank.
Any comments on diameter vs length of the smoking area that is?