Utterly Mad

Detail describing the prison is probably the only thing you'd need to add, I'd suggest that this be delayed for approval until you're finished with it.

Try adding in detail about how things work in the prison, how the prisoners are treated, what the guards are generally like, what the conditions of the prison are, how entrance and exit to the prison is specifically handled. The kind of things you'd need to know to write an RP about this place.