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I'd like to see more on how it's proposed to protect the travellers and the long-stay Mars migrants from radiation. The dosage numbers I've seen do not seem encouraging. Isn't this a major, possibly fatal stumbling block to extensive space exploration?

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10.3 m of water + a strong magnetic field gives you approximately the same protection as the earth's atmosphere. Sadly, that getting that much mass in orbit would be extremely expensive, but a shield provides a long shadow of safe area. Though, in the long term such a shield could be reused indefinably.

On Mars the easy option is to live in a cave.

And, considering the other risks involved I think many would trade a significant increased risk of cancer in their lifetimes for the journey.

The crew would be risking something like an additional 1% chance of cancer in the next 30 years. While the radiation dose is significant, it's an acceptable risk.

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