The problem with this approach is that it looks like anytime you bend space like that, you create a vacuum-energy resonance that destroys the space-time structure you just created. I'm not a physicist and I've never seen anyone state this as a universal rule, but it has come up in the recent analysis of the warp drive (won't try to spell that A-guy's name), in Hawking's analysis of what would happen if we tried to drap a wormhole around such that we can use it to travel FTL, and a couple of other things I've seen too.
I always find it amusing when people look at these hypothetical designs and say "Hey, it must be possible!" Because what I see is a universe that absolutely hates FTL and will destroy anything that looks like it might achieve it with extreme prejudice, yanking the space-time rug out from underneath your atomic feet.
I always find it amusing when people look at these hypothetical designs and say "Hey, it must be possible!" Because what I see is a universe that absolutely hates FTL and will destroy anything that looks like it might achieve it with extreme prejudice, yanking the space-time rug out from underneath your atomic feet.