Cubes VM on Pure OS?

If it is possible, what is needed to get Cubes Os running as a VM in Pure Os? Would this be a secure means of running Cubes Os? Is it difficult to get Cubes Os installed into Virtual Box or Boxes ?

I read that Cubes takes up resources and battery when installed directly on the hardware. Would a Cubes VM be a viable solution to reduce resource use?

Qubes OS provides security through hardware virtualization. There will be no such thing if you install it in a VM. Installing Qubes in a VM is not recommended.