Well I put the pick up rings on to help move it around with a overhead crane. (It's heavy) and the D ring is to drag it around my yard with my tractor. I made the steel frame at work. Then finished up with the decking at home.
I like it...a lot. With its heft though, I'd be more inclined to set it and forget it. How much time did you have in it? It looks like it'll survive Armageddon too. Nice job.
Yeah I had to use my tractor with a loader to get it out of my truck. The main post are 4x4 sq tube 3/8 thick. The top frame is 2x2x 3/16 angle. It's close to 500lbs