Hello Dean,
I have tried recently to install DL/I from moshix github. As far as i understood, it is intended to be installed on MVT, not MVS.
Also using that tape, you would not be able to run third job iehmove3.jcl, cause it does not contain two tapemarks at the end.
Rene Ferland helped me with that and created corrected tape, which i will attach to this message.
Using this tape and MVT i was able to restore all datasets to 2314 DASD SORT01.CCKD that i created beforehand.
If you want, i can send it to you.
Best wishes,
Andre