@covo if your camera body is okay and "just " the lens is cracked, replacing the lens should be "all" that it takes. The Sony α7R II is a interchangeable-lens camera
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Now, if I have misunderstood your question, or if you need more information about your camera, here is the SM for it. It also includes the parts list [document|31633]
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While you work on your camera, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
@covo if your camera body is okay and "just " the lens is cracked, replacing the lens should be "all" that it takes. The Sony α7R II is a interchangeable-lens camera