Looking for a guide that fully describes BAAN migration
to a new server.

Going from a SUN (solaris 2.6) to a new SUN (solaris 8)

There is no good guide and defenetely not one from Baan.
There were some posts regarding migrations/upgrades/move of Baan, those will get you more information:

- http://www.baanboard.com/baanboard/showthread.php?s=&threadid=14909&highlight=new+server
- http://www.baanboard.com/baanboard/showthread.php?s=&threadid=10090&highlight=move+new+server
- http://www.baanboard.com/baanboard/showthread.php?s=&threadid=6529&highlight=move+new+server
- http://www.baanboard.com/baanboard/showthread.php?s=&threadid=98&highlight=move+new+server

And looks like you are keeping the same UNIX underneath, so the first link will be a good pointer already.