The install procedure says to restore InstallESD.dmg to a partition. This turned out to be tricky. Restore from the dmg fails, due to "invalid parameters" .  Mounting the dmg, and restoring with the mounted version works. But then the partition and filesystem verification can fail, which prevent installation. So some tips:

• Create a separate Install Partition
• Ensure that there are no more than 4 total partitions on the drive
• Install Partition should be at least 8gb
• Ensure that the install partition is the second partition
• Ensure the success of  "verify disk" on the whole disk, and "verify disk" for each partition/volume.

OSX did not like the HFS+ partitions that I created with gparted. diskpart complained that there was not enough "loader space" no matter what I did. So within OSX, (on the virtual Mac) I erased all but the invisible ESP partition, and created an install and an OSX partition on the Mac drive. I restored InstallESD to the install partition, and re-installed Clover 1946 to the OS partition. All tests show good. I expect I must reinstall Clover yet again on the OS partition, go get the correct kexts and DSDT.aml.

Now to try booting again.