... update, I got it installed, and got to a login prompt
For MAC:
Steps.
1. Erase USB, label it UNRAID
2 Copy contents of OS distro to USB
3. execute make bootable scripts (this needs the USB to be called UNRAID)
4. Insert USB into Windows machine with WinImage9 installed,
4.1 Select disk at the top, go down to make image from physical disk, select relevant USB and make image, calling it anything...
5. copy to folder where VirtualBox VM will be stored, rename to unread.vhd
6. Boot... Worked.
Want to retry, and select the gui option.
G