Looks like a plate of rolled steel, torch cut to the Dia. that it is now.
Overkill? Maybe, but build it the way you want to.
Keep posting with pictures and let us know how it turns out.

Don

Edit: Nice box in the background!

Last edited by 2-Ton; 11/30/2017 5:11 AM.
1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!