This layout can not be built with standard 9v train track. The
switches have been modified and there are half-curves in the layout.
A few years back, I gave a presentation on this topic was given at a
couple of conventions. The presentation includes
instructions on modifying your own track and suggestions on alternate
geometry. Below are the links to the presentation.
Power Point Document
(You may need to right click and select, save target as...)
Since then, others may have come up with better techniques as I know
there are others modifying their own track, but I don't know the
details of their methods.