Have you actually bought this layout yet? If you have, can you return it? This is about the worst idea I can imagine for building a layout. Everything is built with sheet styrene, which is hard plastic. You'll be building thier idea of a layout, not yours. Making any changes to the track plan or topography will be difficult if not impossible. Even if you got this at a discount price, you're still paying over $700 for what's basically four pieces of injection molded plastic. No trains, tracks, scenery, not even a bridge or building. You even have to provide your own ping-pong table. I can tell you from experience that ping-pong tables make terrible supports for model railroads and, bcause the average reach is 30", you'll have difficulty even reaching parts of the layout to do all the work, and this assumes access on all four sides.
It's your money, SPfan, but this is really a rip-off. For the money you're spending on these hunks of plastic, you can build some really nice benchwork, buy all your track and purchase most of your scenery. The best thing is that it will be a layout you like, not one that some other outfit decides is best for you. Do what you think is best but I think you'll really regret this purchase if your heart is set on it.