This is much simpler than it's made out to accomplish...to install ESXi 5.1 on a 1,1 MacPro all you need is the BOOTIA32.EFI from the VMware-VMvisor-Installer-5.0.0-381646.x86_64.ISO or earlier. With that you can use Carbon Copy Cloner on the Mac to clone the latest 5.1 ISO to a USB drive and then replace the BOOTIA32.EFI on the 5.1 install with the one that works. That's it - attached the needed EFI if the forum will allow it.
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