OK....first off...I am assuming you are not going to change the look of the model IN ANY WAY...but just want to be able to recruit the unit in a building belonging to Thrace and have the unit work for Thrace. There may be a simpler way of doing this, but this way you can change the skin if you want fairly simply ~:D

Step 1) Change descr_model_battle.txt

Open up the file in notepad, and search for roman_velite_gladiator
This is the basic definition for ALL the velite gladiator units. What you have is the basic definitions of the model file to be used, PLUS the bit that tells the game what texture to use on the model when used by a particular faction. We need to add a new entry for Thrace.

copy THIS SECTION:
texture thrace, data/models_unit/textures/unit_roman_velite_gladiator_slave.tga
and add it in after the entry
texture slave, data/models_unit/textures/unit_roman_velite_gladiator_slave.tga

All we have done is to create a new entry which tells the game to use the slave skin on the velite gladiator if this model should be used by Thrace.

Next, copy THIS SECTION:
model_sprite thrace, 60.0, data/sprites/slave_roman_velite_gladiator_sprite.spr
and add it in after the entry
model_sprite slave, 60.0, data/sprites/slave_roman_velite_gladiator_sprite.spr
This is telling the game what sprite model to use when the model is viewed from a long way away. Since we used hte slave skin here, we will also use the slave sprite. OTherwise some odd colour changes would happen when you move towards the unit!

Close this file down now and save your changes. We have finished with this file. ( oh...yes...and I hope you backed up the files first just in case!!)

Next, we have to actually define the stats that the soldier will have. Each model can be used multiple times, but EVERY unit must have it's own unique set of stats. These are defined in export_descr_unit.txt so..

Step 2) Change export_descr_unit

Open up the file, and find the line:
type roman velite gladiator

This is where the velite gladiator is defined. Copy the WHOLE section relating to this unit and paste it in underneath. We need to make a few changes to the new section. First, we give it a new name....so roman velite gladiator becomes thracian velite gladiator. Change the name on the line beginning 'type' AND 'dictionary' but LEAVE the model line alone. This is referring to the actual 3D model cas file used and must be the same as the entry in the last file we changed. Then, you change the faction in the line starting 'ownership' to show your new faction. The new entry should look like this:

type thracian velite gladiator
dictionary thracian_velite_gladiator ; Velite Gladiators
category infantry
class light
voice_type Heavy_1
soldier roman_velite_gladiator, 20, 0, 1
mount_effect elephant +6, chariot +6
attributes sea_faring, hide_forest, can_sap, very_hardy
formation 1.2, 1.2, 2.4, 2.4, 2, horde
stat_health 2, 0
stat_pri 12, 7, no, 0, 0, melee, simple, piercing, spear, 25 ,0.73
stat_pri_attr no
stat_sec 0, 0, no, 0, 0, no, no, no, none, 25 ,1
stat_sec_attr no
stat_pri_armour 2, 7, 5, flesh
stat_sec_armour 0, 0, flesh
stat_heat 2
stat_ground 2, 0, 0, 0
stat_mental 14, impetuous, untrained
stat_charge_dist 40
stat_fire_delay 0
stat_food 60, 300
stat_cost 2, 620, 250, 70, 100, 620
ownership thrace

( if you are feeling lazy, just copy and paste this in right after the roman velite gladiator entry. It can go anywhere actually, but here is a convenient place to keep it! )

Now you can close this file down and save it.

Step 3) Change the dictionary entries.

We need to change 2 files here. The first, like the other 2 lives in the 'data' folder. This is export_descr_unit_enums.txt. Open it up in notepad again, and you will see that each entry has 3 lines. search for 'roman_velite_gladiator' and you will see the format we need for our new unit. The names must match the name we used in the 'dictionary' line on the last file we changed. Our new antry can be added right after the roman_velite_gladiator one, but again, it can be ANYWERE in the file.

thracian_velite_gladiator
thracian_velite_gladiator_descr
thracian_velite_gladiator_descr_short

Close this one down and save it. The next file actually resides in the data/text folder. Go there and look for 'export_units.txt'. Again, search for roman_velite_gladiator and you will find the entry for the roman version. Copy this and make any description changes you want. You can leave the text alone if you want...you MUST, however, change the roman_ bit as follows to match the previouos changes...

¬----------------

{thracian_velite_gladiator} Velite Gladiators

{thracian_velite_gladiator_descr}
Beyond Elite!\nImpetuous\nVery Hardy\nSapping Ability\n\nVelite gladiators are more than mere light infantrymen - they are superb individual fighters, unmatched by any ordinary warriors. They fight wearing little armour - their lot in life isn't always to live through a fight, but to die in an entertaining manner. The style of the velite is one that uses only a spear and shield combination, relying on natural agility to avoid injury and death.\n\nGladiators are used in battle as a specialised elite, one that cares little for personal safety - the only way to attain freedom is through victory! Gladiators, after all, are part of the damnati: the disgraced, the condemned, and the untouchables in society. There is nowhere else for them to go.

{thracian_velite_gladiator_descr_short}
Velite gladiators are more than mere light infantrymen - they are superb individual fighters, unmatched by any ordinary warriors.

¬----------------

Close that down and save it. Now....test your unit in a custom battle. The unit cards will show up as the default grey peasant card, but it should be selectable and should show up in the battle. IF you get and crashes or problems, go back and check CAREFULLY all the above steps.

Assuming this has worked, you can now make th eunit buildable in a campaign. This is easy enough to do...

Step 4) Making it buildable

Go to your data folder and find 'export_descr_buildings.txt'. This defines what units are going to be built by which faction in which building. We don't want to unbalance the game, so the Thracian unit should be built at the same level of building as the original velite gladiator. There is a lot of leeway here for you to change this to suit your own taste...you just have to add the line to the right building! The stock velite gladiator is buildable in a level 3 building 'amphitheatre'. Now...I don't know if Thrace can build this building...so make sure you can! Then, add this line:

recruit "thracian velite gladiator" 0 requires factions { thrace, }

If you want to make the unit available in, say, an archery range... just find that building and paste th eline in there instead! Easy really!

Now..I believe in order for this to work, you may need to start a new campaign. I might be wrong....but now is a good time to test it Your unit should not cause any crashes, and should turn up in your Thracian city build choices when you build the building.