If you've looked at the website much of this should be evident to you, however:
I think it was, prosections are used to demonstrate specific points but I believe full body dissection gives you a fuller understanding of anatomy and how everything relates to everything else.
Undergraduate assessment is done entirely with end of year exams, no OSCEs. My understanding is that clinical students are assessed with OSCEs through the year.
How wide your options are is debatable, the vast vast majority of students will do a Biological Part II or History and Philosphy of Science or Anthropology. To some extent all of these directly relate to the medicine course. Theoretically you can do any Part II you like but you would have to be able to persuade the university and respective faculties that you would be capable of meeting the standard, something unlikely in your example of astrophysics. Certainly I have a friend a few years above me who did Japanese in his third year.
As you say the course doesn't seem to be systems based, so perhaps its subject based then? Hint: Second year
subjects are Pathology, Pharmacology, Neuroscience and Human Reproduction. Worked it out yet?

Clinical contact in your undergraduate years is minimal. Over three years you complete four modules of "Preparing for Patients" this amounts to approximately 11 'days' of patient contact. Some subjects have non patient based clinical sessions (eg. clinically relevant anatomy sessions at Addenbrookes). However there is nothing to stop you organising further clinical work experience for yourself in the holidays, and you will find this quite easy to do once you have the title "medical student".
Finally yes the workload is big, but being a medic is one of the most social subjects at Cambridge and college life can be a good relief from work. To use a tired cliche, we work hard and play hard. I can honestly say, even in my darkest hours of exam term, I have never regretted going to Cambridge.
