I just took some flat bar from work, 3/16 X 2" cut it to about 100 inches, and rolled them into a u shape, leaving the legs sticking up straight. then I punched 1/2 holes in each end, 1" centers, and then broke the ends up 90 degrees, to form the ears.

_..........._
.|..........|
.|..........|
..\____/

^
like that! disregard the dots, they're just place holders. and the bottom part is rounded not flat.

If you give me the radius or diameter of your barrels I can sketch out a modification to that original photo, so the upper barrels would be supported. Can you weld? or have access to a welder? do you have access to steel?