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There is already an eink device for medical pros. It is basically the same spec as an iliad except it runs on windows ce, it's washable and it costs $5000. For that price, the difference a larger screen would make to the cost would be small.
As for having two screens, weight is the primary downside. It would require twice as much battery power too. Personally, I really don't see a need for having two screens on an eink device.
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