Crafting Reinforced armor does not grant metalworking skill in Hibernia.
I crafted the following:
leaf tacuil gauntlets (15 skill)
leaf tacuil boots (45 skill)
leaf tacuil leggings (65 skill)
leaf nadurtha gauntlets (35 skill)
leaf nadurtha boots (65 skill)
and maybe a couple others...None have granted metalworking skill.
Doing equivilent crafts in albion...reinforced armor at the lowest teir gave metal working.
I cannot vouch for higher teirs of crafts, but these low ones are not working properly. They should grant metal working on skill up if not capped.
Below is a SS of a craft.
https://imgur.com/EafnxMS
Edit: I am most likely guessing this is due to hib requiring strips and not metal bars. So if you craft with strips this should cause metalworking to level up.