agree with your comments bhai..... as you mentioned it will be a synonym of cage or prison.
I was not able to correlate word qafas in your sher... bcoz it was resembling there more like a dead body but not like a prison.. i am not sure if i am thinking in wrong way... but there must be a feel of imprisonment .
well don't take it other way , it was just for the clarification. and also its not necessary now to reply back on this.....
if you feel you want to add more then you are most welcome bhai.... otherwise pls ignore.
Thanks....