Ok, I went over the units you mentioned. Some of the armours are hard to identify. Maybe 3.0 will have more detailed units. Anyway, this is what I've come up regarding your suggestions:
Raja's Guard was done.
The Mongols were finished. You must have seen the Mongol units that are not in the game.
Abna Heavy Spearmen and Abna Infantry are wearing light lamellar on light mail(counted as robes?). - I can't see any light mail, only robes on top of their armour. I will need someone knowledgeable about this to confirm things one way or another.
Faris Cavalry and Faris Dismounted Archers are wearing light lamellar and a gambeson. - I agree.
Faris Lancers and Faris Heavy Infantry are wearing lamellar on partial light mail. - I sort of agree. I'm having a hard time telling what they're wearing.
Agulani Horsemen, Azeri Swordsmen, and Azeri Spearmen are wearing lamellar on partial light mail. - I will change these.
Jagirdar Lancers and Dismounted Jagirdar Swordsmen are wearing light lamellar on light mail. - Yup.
Jagirdar Horse Archers and Qiqaniyya Bowmen are wearing light lamellar on partial light mail. - Ok.
Caucasian Mountaineer Axemen are wearing leather. - I'll change them.
Nakharar Bodyguard, Nakharar Knights, and Dismounted Nakharar Knights are wearing heavy lamellar/scale on heavy? mail, and a gambeson. - How about partial heavy mail + light scale? I've decided to allow a maximum of lamellar/scale on top of mail, like I've done for the cataphracts. Heavy lamellar/scale on top of heavy mail would be too cumbersome.
Kartlian spearmen are wearing partial light mail. - Looks more like leather lamellar to me.
Tadzreuli Swordsmen are wearing heavy mail under leather lamellar. - Partial heavy mail + leather lamellar.
Eristavi Cavalry are wearing heavy mail under leather lamellar. - Partial heavy mail + leather lamellar.
Royal Monaspa Guard, Monaspa Lancers and Horse Archers (and dismounted monaspa lancers and archers) are wearing scale (probably heavy scale?) on top of mail. - Partial heavy mail + scale.
Latin Longbowmen are wearing light mail. - Check.
Militia of the Kingdom are wearing light brigandine? - Looks more like leather to me. I doubt militia would have access to brigandine, especially this early on.
Militia of the Kingdom and Christian Crossbowmen are Mediterranean not Anatolian. - I don't understand what you mean.
Late Crusaders mounted and dismounted (Knights of St John, Templar Knights, and Teutonic Knights) are wearing coat of plates. - Changed.
Heroes of the Crusade are wearing coat of plates. - Changed.
Jund Spearmen of the Ayyubid are wearing light mail not leather. - Got it.
Syrian Noblemen are wearing light mail under a gambeson. They should also have a different secondary (A spear is their secondary weapon for some reason right now. - Partial light mail + leather lamellar? Apparently, spears were used for fighting on horseback. That's what I was told in the BC forum when I enquired about it.
Daylami Infantry are wearing light mail not leather. - Some of them could be said to be wearing mail, but a lot more are wearing leather.
Slavic Spearmen are wearing light mail. - I'll change these and the swordsmen from gambeson to partial light mail.
Slavic Cavalry are wearing light mail. - Just like the dismounted versions.
Nomad Tribal Cavalry, Nomad Lancers and aor_steppe tier 3, Nomad Lancers are wearing leather lamellar. - The Lancers yes. The horsearchers are just wearing leather. I will also change the Dismounted Nomad Lancers to leather lamellar.
Kypchak Khan's Cavalry are wearing lamellar on partial light mail. - Ok.
Kypchak Khan's Lancers are wearing heavy lamellar on partial heavy? mail. - Partial heavy mail + lamellar.
Bharat Armoured Spearmen are wearing partial light mail. - It sort of looks like it, but I want to get the opinion of someone who knows about these guys (preferably one of the researchers of BC, or the guy who made the model).
Indian Swordsmen are wearing partial light mail. - Will do.
Armenian Cavalry Auxilia are wearing partial light mail. - Yup.
Archer Auxillia are wearing light mail. - Changed.
Rus Mercenaries are wearing light mail. - Partial light mail, like the rest of the slavic units.
Bado Camel Archers are wearing light bringandine. - I'll change them.
aor_armenia tier 3, Vishap Warriors are wearing light mail. - Ok.
aor_trasc tier 2, Azat Archers are wearing partial light mail. - I'll change.
aor_trasc tier 3, Shubosani Molashqre are wearing leather lamellar. - Agreed.
aor trans tier 4, Aznauri Nobles are wearing lamellar on light mail. - Partial light mail + light lamellar.
Kurdish Peshmerga are wearing light lamellar. - Ok.
Khurasani Nobles are wearing light lamellar on light mail. - True.
Aznauri Lancers are wearing light mail under leather lamellar. - Looked like leather lamellar. I hope to get an expert opinion on this as well.
Hospitaller Mounted Brother-Sergeants are wearing light mail. - Changed.
I've reexamined some other units, and I'm having doubts about some of them. What do you think of:
Metsikhovne Spearmen and Archers - Light mail or partial light mail?
Tawashi - Lamellar or heavy lamellar?
Turkmen Askari Horse Archers - What armour? I got them at light lamellar right now.
Aspet Cavalry - Heavy mail + ____ ? Light mail + ____ ?
Dismounted Aspet Lancers - Light mail + light lamellar.
Samnapah Spearmen - Light mail.
Azat Swordsmen - Partial heavy mail instead of heavy mail.
Mounted & Dismounted Didebuls - Partial light mail.
I've started changing the costs of units, but I want to finalize the armours before I continue, since cost is dependent on armour for some units.