Ok, here what I come up with today.
I found a guy that says he can roll plate into a perfect circle. I ordered a 4' x 8' sheet of 3/16' and am having him shear two cooking chambers 32 inch long and two fireboxes 16 inch long. Now you cant get 16 inch diameter out of 48" width, so I told him to go with 15 inch. Reason is, one piece of plate may be 48 and 1/8 and the next could be 48 and 1/4 wide and I need them to be constant sizes.
The pricing should put me able to sell these two for $500.00 or maybe a little less. Im just going to do the two first to check the quality of the work of this supplier with out too much money invested. At the least, these two units should pay for my material list on the 14 inch models, or if they turn out good, may stay with this size.