@geardog I think I understand what you did. Let me say this with my words. You built a FOG server but did not have the space on the small VM, so you connected via NFS to an external NAS. You mapped the /images over to the remote NFS server wanting to borrow space from that external NAS.
If that is the case, then you can’t do that with NFS. Basically you are trying to reshare a network connected drive. This is akin to taking server A and mounting a directory from server B as the W drive, then trying to share the mapped W: drive to a third computer.
The only way to make the above scenerio to work is via mouting the remote disk as an iscsi LUN on the fog server. map that external iscsi lun over the /images directory. Then install FOG. That will work because the iscsi lun is a block device, and nfs is a file level device.