Having a Masterbuilt Pro 18.5" Kettle I found this Sazon 52 quart pot $36.99 the only 80 Quart I found was $125.00 me not being frugal Cheap is a better word. So Lowes has some flat stock 24x24 for under 20 bucks. decided to use that on the bottom of the pot. Still have to get some screws tomorrow, but here is what is done.
Plate drawn out 1 rivet in the center
Use a ruler with a whole to make inside line no pic
Started the cut with my Dremel then finished with jig saw
I riveted the bottom before cutting
Trimmed an old grate to fit and had an old water pan
This will be one of my shelves