Hi,
most of the stuff from failsure.net should be in
https://www.amigaunix.com/. I haven't gone thrue all the old text and checked that every file is there, but let me know if you find any errors.
I used the instructions there and the script did run Ok (as I wrote above) but I don't think I ever returned to test it (ie. to do a full install from the re-created tape). I probably still have the tape somewhere, but I am in a middle of a house move at the moment so I can't get it checked right now.
I added my old re-creations of the floppy and tape labels (see the end of the page):
https://www.amigaunix.com/doku.php/tape-creation.