m15 R1, advice for SSD upgrade?

Below are my Hard Disk specifications which show One Hybrid Drive and One SSD, 

 I have a couple of questions

1. If I search by part # 3VFCP, I think the SSD is of form factor 2280.  Am I missing anything?

2. Can I replace Hybrid Drive completely and install a single SSD, is it recommended?

3. Some SSDs are available with heat-sink, any advice for this? I doubt there is space available for the external heat sink. I have only a reference of photos available in the manual.

Thank you