By the same token, and to address the thickness or lack thereof of the bucket and armor, I wonder if the thing could be strengthened with fiberglass from the inside?
It could melt the ABS, but I'm sure there is a way. It should be fairly sturdy as is though. It is weak and floppy until it is assembled, it becomes quite a sturdy structure.
edit: I remember it was styrene I accidentally melted with fibreglass, not sure about ABS