It seems OK to use an existing domain.
Looking at your source showed that you have used far more html coding than this introductory course even considers. Hope you actually enjoyed your P2PU html work for this course.
Just a question: What made you decide to use SPAN around each of the star characters in your "skills" section?
Did the stars not work without them? Was the html hand generated or did you use some other tool to create the code? I just tested without the span code and got the same look.