That is by design yes, but you're not the only one that isn't thrilled with the layout. As such, future mods will have icons more like the previous ones and I will be changing it when I do a round of revisions (after I finish the other weapons).
Helmets will run the gamut from realistic bronze age helmets to 17th century lobster tailed helmets, things as popular as the ones you mentioned will definitely be present.
I have not started planning out the armors yet, but much like the other mods, they will lean towards realism if I can manage.

Are the inventory images supposed to look disassembled? If so.. ehh not really a fan. Aside from that, I love all of your overrides. I've always felt that the stock models were overly gaudy to the point of ruining immersion. Your models look fantastic. Especially these axes. I really hope you continue making these.
When you do helmets, please include a Spangenhelm, and Norman nasal helm with Coif. And an archer's Kettle hat. Hopefully you can do something for the body armor as well. I would kill to see a decent mail hauberk that actually looks like something somebody somewhere would have worn instead of the Rob Liefeld inspired clown costumes we get with the stock models.

i love all of these replacements, i cant wait for the spears and polearms!

U.u

Thanks! I've not made any attempts at armor yet, but odds are I eventually will. There's still plenty of weapon and shield types to go, though, and I'm also more inclined to try my hand at helmets first.

Keep it coming! This stuff is the best! Do you plan to do Low Magic Armor pieces?