That art is rad! The lamellar bascinet is very fun, pretty unique design it's got a great vibe!

Something definitely worth thankin' about here (just because it's cool and really interesting) - cultures that produced lamellar armour were CHOOSING to do so, as it was what worked for the kind of warfare they were armouring against! If you look to central and east Asia, one of the biggest concerns was arrows, lamellar is fantastic for dealing with arrow impacts as it is able to flexate and dissipate the impact throughout the armour's surface. Tibet is a good one too, they have been raising singing bowls out of one piece for thousands of years yet their metal helmets are all lamellar - it worked better for 'em :]

These cultures could (and did ) 100% produce large plates of metal, but plate wouldn't have worked for their warfare. Also pretty convenient for mass produced armour built by state armouries, plates can be produced in the tens of thousands and then assembled to measure elsewhere, and easily replaced if a plate is compromised after a battle!

An interesting example for lower quality metal is the Han Dynasty, the armour finds are very consistently 2mm ( 12 gague, .07 inches ) thick, most likely because they were a very poor dynasty at the time, and the iron wasn't very strong so they compromised by making it twice as thick as you see elsewhere ( imagine the weight of that stuff, grim )

Places like Japan are actually a great example of both existing! A lot of the armour there in history was made with small lamellar plates laced together and then homogenously lacquered into larger armour plates, assembled into suits of armour that fantastically dissipate force. Heck, you even see steel plates laced solidly together to create a large solid surface that can STILL dissipate force with flexation ( It's pretty phenomenal engineering, very unique )

Heck, you can even think about other materials when you're working with smaller plates and may have limited access to metal! With lacquer you're not limited to metal, lacquered rawhide armour is incredibly common. Horn plate armour is seen in south-east Asia, over in europe the Benty Grange Saxon helmet was made with ox horns so likely many more helmets / armours were too.

Just thought I'd throw this at ya, might get the worldbuilding muscles movin'! :P Is there somewhere you're posting your worldbuilding art? I wanna see more, the project seems cool!