This bed lift uses:
An ex Ambulance winch motor.
A second-hand Ikea bed frame from marketplace.
6 pulleys.
20M of 4mm Dyneema rope.
4 M6 threaded eyelets.
A winch fairlead.
Two standard 30A Automotive relays.
Some scrap aluminium angle.
I also used four lengths of slotted shelving to act as safety stops and support one end of the bed when lowered.
Total cost in parts to me has been around £100