the FreeBSD VM looks good - but the SCo-VM will not work with those settings.
You configured it to use IDE1:1 for the harddisk - that will not work.
Use scsi0:0 instead and make sure the scsi controller uses BUSLOGIC.
Also make sure you use
guestOS = "unixware7" and not "other"
Do not assign that much RAM - use 128 MB as a start