you kind of have me at a loss on this, what kind of tubing or pipe is the boiler made from. I would steer clear of that as it doesnt sound like a good thing to use.
my advise is as follows, follow it or not.
If you arent familiar with tubing, bends, and what strength areas you need for a cage, dont build your very first one. Dont get disappointed, find someone who has built a few and pay them and have them let you help. I think I have helped 15 people learn about their cages and why I build them a certain way. Safety is a must, and you shouldnt build safety equipment unsafe.
There are some books out about making cages (stack car mostly) but they will help.
If you are a compitent welder and fabricator, then use some HREW or DOM tubing of a wall thickness of .120. That is all I use. All my cages are 1.75 inch diameter and .120 wall.
The box is easy, maybe some 16 guage steel bent into a box and a top fabbed up. I dont have any pictures of what you have, so on the box I cant really visualize what you need. Your local Vocational School can help you out, they always have welders needing projects and you just pay for material, I just wouldnt look for them to build you the cage.
Other than that, look at other designs, find one that meets your fancy, ask tons of questions and get some help. After all, is better to have a bad day wheeling and to have to avoid and obstacle than to be dead.
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