http://www.twcenter.net/forums/showthread.php?t=465755
You've edited your post, but the thread title remains, so without a question I will give an answer:
You can change the unit size in the EDU:
type Kataphracts
dictionary Kataphracts ; Kataphracts, Elite
category cavalry
class heavy
voice_type Heavy
banner faction main_cavalry
banner holy crusade_cavalry
soldier rhunka, 30, 0, 1
officer rhun_captain_early_flag
mount eastern armoured horse ; +7 armor
mount_effect elephant -4, camel -4
attributes sea_faring, hide_forest, very_hardy, can_withdraw, can_formed_charge, free_upkeep_unit, command
move_speed_mod 0.85
formation 1.5, 4.4, 3, 6, 2, square, wedge
stat_health 1, 3
stat_pri 8, 13, no, 0, 0, melee, melee_blade, piercing, spear, 45, 1
stat_pri_attr no
stat_sec 12, 4, no, 0, 0, melee, melee_blade, piercing, sword, 15, 1
stat_sec_attr no
stat_pri_armour 21, 5, 0, metal ; advanced lamellar + plates + horse armor
stat_sec_armour 0, 0, flesh
stat_heat 9
stat_ground -2, -3, -5, -2
stat_mental 16, disciplined, highly_trained, lock_morale
stat_charge_dist 45
stat_fire_delay 0
stat_food 60, 300
stat_cost 1, 1760, 660, 75, 75, 1760, 4, 100
armour_ug_levels 5
armour_ug_models rhunka, rhunka_upg
ownership venice
era 0 venice
era 1 venice
era 2 venice
recruit_priority_offset 176
The first number on the "soldier" line controls the number of soldiers in a unit. The number is for the Small Unit setting, so on Huge Unit setting it will be multiplied by 2.5 for 75 soldiers. 100 is the largest number you can use in the EDU, since on Huge Unit setting the unit will have 250 men, which is the highest the engine allows.