Pull out bed, retracted

Hello, My girlfriend and i are converting a Merc Sprinter into a camper and this is the best bed idea we've seen!!! Could you please tell us how you built this?!
It'd very appreciated!!!

Many thanks

Rog and Lou

These are slats taken from an Ikea bed. On the left of the pic a rail attaches to the kitchen area. The slats then slide forward resting on the rails either side.