A few mod ideas

Hello supportive and helpful modding community!

I come here today to bounce a myriad of ideas off ye heads! PREPARE YOURSELVES!

1. Unit creation traits that are tied to research, and incur other resource costs! I think this would be cool, but I can't think of any ability ideas. Maybe a 'heart of the bear' ability that would give a unit a weak maul capability? Or a dash ability that lets you double move, but dazes? Idk. DISCUSS!
2. Independent enchantment slots for infantry weapons. Would be upgradeable like current weapons and armor, and work like the trinkets that add elemental damage, but they would upgrade as you research better or more costly enchantments, and not take a trinket slot. So you could give a unit double axes, and an ice enchantment, upgrade the axes, and keep the enchantment! Perhaps the same could be done with armor somehow. Maybe higher quality items would let you have a higher quality enchantment?
3. A mod that would change the units in the training menu to be the version that you can afford at the moment. For example, if you have researched everything, and can make defenders in champion plate, but are out of crystal and iron, then the defender unit that is trained from your menu is in leather. This would let you upgrade later.
4. Firearms. I love it when magic is not exclusive to technology. A bayonet and musket could be done in game right now. It would be the same as a spear, but offer a strength 20 attack on a 5 turn cooldown. for those who missed out on precious crystals and shards.
5. Greater light armors. Studded leather, slightly higher armor, no init penalty, tripled production cost. Brigandine, minor init penalty, better than studded. worse than chain or plate. Some magical counterpart. No proficiency to use. (Also maybe a magical counterpart to chain, for chain based civilizations).
6. The ability to try Mimbly for crimes against the crown and have him executed.

So, I am actually interested in making some of these ideas come to life. I know that .dds or .png is good for making items, but does anyone know what to do if we want to make our own models? I am very much interested in making some custom models for the light armor ideas.