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Do you have enough room to construct a false ceiling? Four posts going up to near the ceiling, an X pattern between them, perimeter members. Essentially all the edges of a cube with an extra X on the top. Build that out of 2X4 or 4X4s (I would go 4x4 vertical posts, 2X4 bracing). Then slap a sheet of plywood/particle board on the top for added reinforcement. Problems - frikkin HUGE to leave enough space for you to move around the bag, fair amount of work, would have to be disassembled to move it, etc. Just a wild thought to consider.
If you are thinking more of the traditional corner hanger-
Would your bag be free hanging, or tethered to the base? Tethered would be easier to deal with because of less swinging, but I personally dont like them.
The obvious issue is tube strength. Are you a good welder or know someone that is? Or are you going to use steel pipe and fittings? Given a constant wall thickness, the larger the diameter the better. Given a constant diameter, the thicker the wall the better.
The 2 other issues that pop into my head right away are the cantilevered nature of the setup and the radial/lateral stability. Unfortunately the cantilever cant be avoided if you actually want to be able to hit the bag. I would try to use 2 hangers - 2 cantilevers meeting at the bag. Hopefully this would give great strength and aid in the radial/lateral stability. I think a 30�° angle between the two would still give plenty of striking room around the bag.
Now the lateral stability. The only way to deal with this is width/diameter of the base, unfortunately. Connecting the cantilevered arms to the base with some corner bracing and run the base as wide and deep as you can fit.
My initial thoughts, they might be crazy. I might try to sketch something up to make more sense.
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