Now got Ubiboot working with help from this thread, the Readme file and this http://wiki.maemo.org/Ubiboot and have installed working Harmattan, Firefox, Nitdroid and Nemo.
Only file miss installing is this 'SailfishOS Files' from wiki. Ubiboot side.
What to do with this there is no explanation?
Just unpack it in Alt_OS as with Nemo and change the Ubiboot.conf prepared for Sailfish too or what to do...?