FWIW,
FIRSTLY, take care not to have the lathe topple oiver! It won't do the lathe or you any good whatsoever!
Use pinch bar to raise one end of the box, until a length of round bar can be placed underneath.
Move to the other end and repeat.
Roll box, with lathe on top, to and fro, moving the Tailstock end sideways, as far as possible each time, until the box and lathe have been rotated through 90 degrees.
Use pinch bar again to retrieve the bits of bar. Job done.
Remember to leave clearance behind the Headstock, so that longer pieces of can pass through the Mandrel.
Being a Loughborough, long work pieces through Mandrel will, be small diameter, so can't be too long, or they will "whip"..
HTH
Howard