As Belkar Bitterleaf says: "Well, I just figured we'd wander around, kill some sentient creatures because they had green skin and fangs and we don't, and then take their stuff".
http://www.giantitp....s/oots0013.html
Nothing politically correct about that ;-)
I can confirm that the cage wall and cage top only exist in the toolset if you have the expansions installed.
Maybe it's time to spend US$9.99 at Good Old Games (gog.com) and get the full Diamond Edition?
As I said in another post, it's possible to install both the unexpanded and expanded versions on the same computer, which is how I managed to confirm the non-existence of the cage wall & top in the unexpanded version.