My trailer currently does not have a cage, and I could use one for extra storage. Considering that the structural components of most cages is angle iron (tubular if high-end), I had considered constructing one out of some unused bed frame rails I have. Yes, I actually have about 8 rails I will never use, but acquired over the years from people I know who were going to throw them away. Now I may have a use for them. Is this doable?