There were two guys that had ceiling layout systems down here in Austin, TX area. One used copper pipe and wood that was similar to the ones pictured above. We had this style in the model train store I worked at for a G scale train.
The other was very unique and the used wood. They made it look similar to narrow gauge trestles. He advertised in the store and sold kits online. He did several for both G and O scale. Here is their website. Ceiling Train Kit
The only thing I hated was getting up on a ladder to change out the trains. But it is definitely a cool way to run your trains! So good luck with yours!
