That is only the case with default line configurations. You can change the symbols in the 2d tab Line Configuration option.
However, this is answered in several stickies in the pepakura forum. You will have a lot easier go of it if you read them before attempting anything.
In the case that you haven't really looked around yet, there are several types of Mk VI pepakura helms. The one in the How to Use Pepakura sticky is the H2, Slyfo has the H3, and dannifood4less and flying_squirrel have custom-detailed H3s.