Hey Tommy, and welcome aboard. Once you learn the basics of how to build models for the FPSC engine, you can pretty much make any type of level you can think of. As far as building an entire level which would include ground surfaces, structures and so-on, the main issue you will face is collision. In some cases it may work just fine depending on the type of level you are building, but the combined use of segments, and entities eliminates 99% of this problem.
Depending on your POV, this can be good or bad. If your looking for an engine that can produce game levels easily, and with a relativly small learning curve FPSC is the way to go.
Good luck, and hope to see some of your work soon here on the forums. All my best.
In the Universe, nothing ever stays the same.