Our development focuses mainly on following two commands:

capstan package compose <IMAGE-NAME>
capstan run <IMAGE-NAME>

But the capstan package compose only supports QEMU hipervisor, while the original capstan build supported a variety of them (VirtualBox for example). I guess it should be fairly easy to bring support for

capstan package compose -p <HIPERVISOR> <IMAGE-NAME>

since the code is already there, just need to connect it right.