I love the look ... this is a ship that demands its engineers put on spacesuits and get their hands in a vacuum once in a while!
This is not an inertia-less drive and therefore acceleration must be limited to G forces that the human body can tolerate.
Hmmm ... wouldn't the g-forces felt by the occupants be the same as any body pulled to a greater gravitational body; that is, free-fall? Instead of g-forces being the limitation, the close association of positive and negative gradients probably causes unusual tidal
effects that present an upper limit for ship and crew.