I agree with Scott that this looks like a cool plan, but the grades will be pretty steep. Based on the overall dimensions of 36x80", I'd estimate that the run from the switch at the back to the bridge at the front will require about a 4% grade. This will limit your train length, but so does the overall size of the pike, so maybe that's ok.
It says it made from EPS foam - the white packaging kind. That does not do very well with carving, but it's probably ok if you don't plan to reshape any terrain.
-Gary