There are plenty of unit slots left, there are no more slots for models. I have added myself about 5 or 6 new units based on bodyguards. And EB runs fine, no crashes(RTW.exe).

Original:

;503
type hellenistic cavalry pontos late bodyguard
dictionary hellenistic_cavalry_pontos_late_bodyguard ; Pontos Late Bodyguard
category cavalry
class heavy
voice_type Heavy_1
soldier hellenistic_cavalry_hetairoi_molossianagema_ponitclatebodyguard, 10, 0, 1
mount hetairoi companion horse
mount_effect elephant -1, chariot +2
attributes sea_faring, general_unit_upgrade, hide_forest, hardy
formation 1.5, 4, 3, 6, 3, square
stat_health 1, 1
stat_pri 5, 44, no, 0, 0, melee, blade, piercing, spear, 200 ,0.4
stat_pri_attr ap
stat_sec 11, 25, no, 0, 0, melee, simple, slashing, sword, 0 ,0.11
stat_sec_attr ap
stat_pri_armour 16, 12, 0, metal
stat_sec_armour 0, 0, metal
stat_heat 4
stat_ground 0, 0, -4, -2
stat_mental 18, disciplined, highly_trained
stat_charge_dist 30
stat_fire_delay 0
stat_food 60, 300
stat_cost 1, 2122, 0, 100, 160, 2122
ownership carthage

Edited:

;503
type hellenistic cavalry pontos late bodyguard 2
dictionary hellenistic_cavalry_pontos_late_bodyguard ; Pontos Late Bodyguard
category cavalry
class heavy
voice_type Heavy_1
soldier hellenistic_cavalry_hetairoi_molossianagema_ponitclatebodyguard, 25, 0, 1
mount hetairoi companion horse
mount_effect elephant -1, chariot +2
attributes sea_faring, hide_forest, hardy
formation 1.5, 4, 3, 6, 3, square
stat_health 1, 1
stat_pri 5, 44, no, 0, 0, melee, blade, piercing, spear, 200 ,0.4
stat_pri_attr ap
stat_sec 11, 25, no, 0, 0, melee, simple, slashing, sword, 0 ,0.11
stat_sec_attr ap
stat_pri_armour 15, 12, 0, metal
stat_sec_armour 0, 0, metal
stat_heat 4
stat_ground 0, 0, -4, -2
stat_mental 18, disciplined, highly_trained
stat_charge_dist 30
stat_fire_delay 0
stat_food 60, 300
stat_cost 1, 4358, 1078, 100, 160, 4358
ownership carthage

You do the other units you want based on this.