This thing might not be that important or ever be built etc., but I did like the thought process revealed by the design. He seeks niches or exclusions in otherwise "impossible" general characterizations of a problem, and unique solutions emerge. The not-fully-evacuated tube is probably the primary example. Overall technically pretty interesting. But as a practical matter, I think a cramped windowless pod pulling .5g here and there in addition to smaller frequency swaying amounts to "The Last Train to York-ville" for most non-fighter pilot citizens.
R.
