I've attempted to create a unique unit with a custom art define model, which is the bear from Civilization 4 i'm using. However, this is the art define i typed down:
and the changes don't take effect, instead it keeps the warrior unit model:
In my opinion the art define looked easy to put in Civilization 4, unlike that, it looks quite confusing.
Code:
<GameData>
<UnitArtInfos>
<Row>
<UnitArtInfo>
<Type>ART_DEF_UNIT_POLARBEARGUARD</Type>
<Formation>Phalanx</Formation>
<DamageStates>1</DamageStates>
<UnitMemberArt>
<MemberType>ART_DEF_UNIT_MEMBER_POLARBEARGUARD</MemberType>
<MemberCount>10</MemberCount>
</UnitMemberArt>
</UnitArtInfo>
</Row>
</UnitArtInfos>
<UnitMemberArtInfos>
<Row>
<UnitMemberArtInfo>
<Type>ART_DEF_UNIT_MEMBER_POLARBEARGUARD</Type>
<fScale>0.15</fScale>
<Granny>Art/Units/bear.fxsxml</Granny>
<Combat>
<Defaults>ART_DEF_TEMPLATE_SOLDIER</Defaults>
<Weapon>
<WeaponTypeTag>BLUNT</WeaponTypeTag>
<WeaponTypeSoundOverrideTag>BLUNT</WeaponTypeSoundOverrideTag>
</Weapon>
</Combat>
<MaterialTypeTag>CLOTH</MaterialTypeTag>
<MaterialTypeSoundOverrideTag>FLESH</MaterialTypeSoundOverrideTag>
</UnitMemberArtInfo>
</Row>
</UnitMemberArtInfos>
</GameData>
and the changes don't take effect, instead it keeps the warrior unit model:

In my opinion the art define looked easy to put in Civilization 4, unlike that, it looks quite confusing.