Most ships built for travel between the planets were like massive buildings, one floor above another with the thrust of the Epstein drive at the bottom providing the feeling of weight for whole voyages apart from a few hours in the middle when the ship flipped around to change from acceleration to slowing down. But Epstein or not, no ship could afford the power requirements or the heat generated by accelerating forever. Plus, Einstein had a thing or two to say about trying to move mass at relativistic speeds.
