I'm buidling my first Z scale layout. I'm using IBL cork roadbed. I was thinking I wouldn't ballast the track right away but possibly do it down the line. I was also planning on adding catenary at some later date. Then I started leaning toward doing ballasting right away. But I've realized that if I am going to lay ballast and I want catenary I will have to do catenary first because the poles slot into the track. If I lay ballast this prevents me from added catenary later. Yes? Is this thinking correct or are the effective ways of adding catenary later even when ballast has been laid? Would welcome any comments. Thanks.