Create UX Case study with Heuristic Evaluation but no user research

I have performed heuristic evaluation on a couple of websites and have them recorded on my notepad. I am re-designing the screens as per my findings from the heuristic evaluation.

Could you help me with the below questions please?

  1. Is it ok to prepare a case study based on the heuristic evaluation and corresponding re-design without any actual user research ?
  2. Does it qualify as a proper case study since i have findings about shortcomings of a wesite an I am trying to improve the experience ?
  3. Is this kind of case study based on Heuristics Evaluation worth including in portfolio ?