X-1: http://up-ship.com/blog/?p=15364
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XP-83: http://up-ship.com/blog/?p=15368
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X-2: http://up-ship.com/blog/?p=15373
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X-1D: http://up-ship.com/blog/?p=15378

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XP-83: http://up-ship.com/blog/?p=15368

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X-2: http://up-ship.com/blog/?p=15373

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X-1D: http://up-ship.com/blog/?p=15378
