Realistically, the OP (probably) has done more work on his project than he is sharing here, and at any rate, he likely won't change his approach based on our comments -- imagine telling your advisors you went to the internet for advice! :-)
However, I do agree that case studies can be valuable in some respects, though I'm certainly not a professional.

Secondly, I find it interesting to note that Walden University (unless I am mistaken; I just googled it) is a for-profit, accredited, online university. While this may not necessarily affect the quality of the OP's work, I thought it may interest some posters. It may also lead to some logistical issues for the OP, although on the other hand it does mean he can remotely interview anyone.