Chip,
First step is deciding if you want to use software. If you do, I recommend trying either SCARM or AnyRail (Windows) or Rail Modeler Pro (Mac). Here's a very "quick" version done in SCARM using FasTrack O-48 curves. As you can see, it needs a space that is 13'x14'. Track count is 55, so it's well within the 100 track limit of the free trial version of SCARM. The green track is elevated to 5.5", the height of the Lionel FasTrack Elevated Trestle set, and you can see the grades. You can do a smaller version using O-36 curves, but it's not going to look like what's in the video because of the tight curves and the bottom grade will be steeper unless you lengthen the loop by adding straight sections making it an oval. You can do a larger version with O-54 and O-72 curves to get smoother curves closer to the video, but that requires more space. Portability is problematic, you'd have to break the layout into much smaller modules.