SAP Fiori Licensing

Hi All,
We are planning to implement fiori into our landscape. We currently have SAP ECC 7.4 and SAP SuccessFactors license for 300 Users.
So now the questions are:
a) Will Fiori be free for all those 300 Users?
b) We also have Salesforce CRM users who don't have a SAP User Id and Password. Can they access the Fiori Apps with a Service Account without a SAP License.
c) What if we can create custom UI5 Apps that look like Fiori( SplitApp etc. ) and don't install Fiori. Can we then extend those apps to Non SAP Users?

These questions are very important because it will determine whether we want to go forward with Fiori or not. Kindly, advise.

Thanks
Sahil