I've yet to draw in the service-bots including DAEDALUS the repair-bot. The human owner would have no reason to access the roasting hot engine compartment, so the elevator doesn't go down there. Maybe there will be some sort of emergency hatch in the cargo deck. I haven't even drawn in the main airlock yet. But more likely I'll be hand-waving most such things as this is meant to be promotional material rather than proper blueprints and is based on nonsense science, ie in reality the ship would probably be like 95% reaction mass with just the nose as living quarters.