I made my outdoor barrel cook stove with this method. I selected a barrel that had two raised ribs around it. I cut the barrel in half between the ribs and cut the end with the bungs off one inch below the level of the barrel [about two inches below the rim] using a large adjustable wrench open just
enough to fit over the cut edge I pried the one inch out slightly so that it would fit over the bottom half. I cut the remaining piece lengthwise along the welded seem so that I could turn it upside down and snap it over the rib of the lower half. I cut matching square holes in the top and bottom pieces below the rib but leaving several inches for sand and ashes in the bottom of the barrel. Before I pounded the top on tight I added the draft and after burn draft and the opening for the chimney. The stove pipe hole is made by drawing a line around the stove pipe circumference half way between the two bungs next to the rim on one side. Cut from the center of the circle to the edge so the each radius is 1/2 inch from the last at the circumference. then bend the resulting little triangles inward at right angles to the top. Make sure the crimped end of the pipe will fit in the hole then bend the tips of the triangles up to hold it in place. Make a two inch steel pipe six inches shorter than the height of your stove. threaded on one end and screw it into the inside of the large bung. To make the after burn draft start with a threaded nipple and an elbow that will screw into the inside of the small bung. cut a pipe that will go from that elbow to the side opposite the stove pipe
thread it and add an elbow and screw the other end into the first elbow. repeat to the side with the large bung and then to the stove pipe. The last two pieces of pipe can have hole drilled through them because as the air expands it will come out the sides as well as the end to burn the smoke going up the stove pipe.
This stove could be mounted in a masonry structure with a small barrel above the smoke going around it to make an
oven. If it is convenient to
feed the fire from the back of your structure then put the stove pipe above the door. Then the front cooking area can be shielded from the heat on the side of the barrel by the masonry. If the fire must be tended from the front then put the top on with the stove pipe opposite the door. If the stove can be mounted on the end of your structure then you could have two sides shielded from the heat. That opens the possibility of multiple ovens above your cook surface and grill.
I hop this gives you some idea of the possibilities.