SCO

Having fiddled and pfaffed with LD_LIBRARY_PATH setting it to all the libraries mentioned when I ran the command "ldd edge" and getting nowhere, I found a way to debug edgemenu as follows:
..
1. export EDGE_DEBUG=enable
2. Start Edge with edgemenu 2>/tmp/edgedebug
..
Produces a nice debug file which I've uploaded and attached ... but have yet to decipher. Perhaps you may have some idea?

The issue appears to have been a missing "dac" module from /etc/conf/sdevice.d when RecoverEdge was trying to build its kernel image. The dac module relates to the implementation of ACL.
I merely copied one of the other module files (pci) in /etc/conf/sdevice.d, edited and changed all references from "pci" to "dac" and then changed the N to a Y in the file. After which the new recovery kernel and image was successfully created ...
Now to see whether we can use it to recover the system!

Are you going to try 'fsck'ing the RAID5 root file system prior to restoring the 7.1.4 root file system?

---------- Post updated at 03:15 PM ---------- Previous update was at 03:03 PM ----------

Yes indeed. That is what I have done.
Unfortunately /stand cannot be fsck'd and cannot be mounted.
Microlite says it cannot initialise it either.
My thought is to recreate the whole HD - like mkdev hd?
But would value your thoughts on this route and if possible a basic plan I should follow.
..
Microlite did "see" the 2 other data disks as c0b0t1d0s0 and c0b0t2d0s0 but said these were unknown entities as far as it is concerned.

If you look at the raid5 configuration, are there three logical disks or one?

There are three logical disks. It would seem to me that the best way forward would be to try to find the disk layout (partitions/slices and filesystem types) information of the 2 data/backup disks (for which we know the raw device names - c0b0t1d0 and c0b0t2d0.
Question is - what is the best way to get this info.
Once we have this and presuming the partitions/filesystems are intact, we could mount them and recover the data on them.
Your thoughts and ideas on this - as always - much appreciated