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An 11" screen is too clunky to be easily portable, and the current 6" screens are too small for technical manuals and pdfs. Perhaps a good compromise would be a double 6" or 8" e-ink screen in a clamshell design. Use it in landscape mode for full-page pdfs and in portrait mode for reading novels. (As a bonus, the double page would more closely mimic reading a paper book).
The extra battery power to operate two screens would be offset by requiring fewer page turns. As to the weight and thickness of such a unit, all I can say is that each new generation of e-readers is getting thinner and lighter. The downside would be the cost of 2 e-ink screens if I'm correctly assuming that the display is the most expensive part of an e-reading device.
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