Bed solution help

[Lizzie Devane]

I really want to recreate the bottom part of this incredible modular wall/bed:

https://www.dezeen.com/2016/07/12/yves-behar-...

I don't need it to be robotic in any way. I just need the flat "pedestal" looking thing at the base of the unit. I want a pedestal that can accommodate a queen bed and double as an upholstered bench or seat. It doesn't have to come upholstered, but I just can't find a "platform" or "cabinet plus queen trundle" or "platform and sliding bed" solution anywhere.

Thanks so much for your help!!