I've made two henchmen through this method, Azrael the Enchanter and Mandos the Fighter, both work perfectly well. Only thing I noticed is that in your guide you have the line
* Create the path Divinity - Original Sin\Mods\Main\CharacterCreation\HenchManPresets\
while your youtube vid shows you doing DOS\_DATA_\Mods\Main etc.
Obviously, it didn't work for me unless I moved it to the data folder, but from there on it went fine.

Otherwise, they function as intended mostly, I noticed I couldn't have capitalized letters in their filenames (azrael.lsx mandos.lsx), and I think the game skipped their level 2 attribute bonus when they were autoleveled to 3 (my characters were lvl 3 when I hired them), but this is probably due to other bugs. I haven't hit 4 yet, so I don't know if they will get that attribute point.

Thanks for the great guide and work!