OK to ask a professor at my institution with whom I have no previous relationship some questions relating to hobby-project?
One of the perks of being a college or university student is access to the faculty for academic purposes.  Ph.D's become professors at community college particularly because they want to be engaged with students and their curiosity without the enormous overhead of excessive grant writing, etc. In short, they basically live to work with curious students like you.


  Ok to ask random professor questions relating to hobby-project?


Yes, and if you show half the courtesy and respect in your introduction to the professor that you did in this posting, you can rest assured that the response will be solely a function of his/her current availability.