Yep, I did it.
It's really long to explain how, and it's a pain in the a** to make it, so I would like to release the file.
You can find 1st_read.bin here :
http://members.lycos.co.uk/megalexxx/Patches/
the file is Alx-bdwn.zip
Follow echelon tutorial to make a selfboot game.
The LBA I used is 11702.