Well Hello,
i decided to posted after testing thing right and left to become a little bit familiar with the dev kit.
before going into the issues, i’m not a dev or something i do that for fun and because i like to tamper with thing 
so i have surely overlook the good thing to do 
i was trying to make a family of t-rex
so i created 3 duplicated of the rex bp, rename them, add them to the gamedata bp, create a copy of the testmap to test (remove all those useless ramp and water from the map ^^) and make them spawn, until here it work, even the limiting of the range of level for each
the name were easily selected :
Baby_rex (lvl 1-10)
Teen_rex (lvl 11-20)
Adult_rex (lvl 21-30)
you see where i go i’m sure
after taking some time looking at the stats editing for them (still not completely sure of how it work since it is such a “whorehouse” (go see ps plz) in here :D) i decide to look at how to make them differentiable from the look, i did some test, from using the scale property of the meshe or the component in the transform categorie of the bp.
the two seem to work identically, reducing the size of the dino.
a nice family photo
the issue i encounter is that if i forcetamed them to test and ride them, the player is also resize when riding them :s so if you ride the baby t-rex you become a Lilliputian
see with the teen version (0.6 scale.)
normal player size
and
riding player size
so i’m here with my small player on a baby rex
anybody know what i need to change to be able to have a normal size player on him? or if i need to use another method than the scale in the bp to change their size? (and if possible only the player, the saddle resizing is good and the glass too :p)
and another thing with the smaller version of the rex :
i did change some offset value for the attack to work properly, principally the attack offset in the dino bp, and the attack destination offset and attack range in the ai bp. (the dino stopped moving too far away from me so he attack for nothing, need to change the value to make it come close enough to actually touch me when attacking)
for now it seem to work, it’s just that do we have a way to see the unit of the meshe or anim somewhere so that we don’t have to randomly change the value? (i did think of duplicating the mesh of the rex and resize it then look at the floor and count the square would it work? )
i’m sure i will need to do some change in the physic too no?
i will have an issue later with the leveling, since i can’t seem to figure out how to change the scale of a dino when he lvl up (for the tamed one if you tame a lvl 1 it will forever stay small even at lvl 30 :s)
if only i could just specify a range of level per dino with special scale with only one bp
well good luck to all of you modder for your project, especially cwm33 (yep i love it’s mod :D)
Ps : the “whorehouse” is a literal translation given by google for a word that i was not sure of how to translate it, and it give me only this translation no other option you can test, b.ordel from french to english, b.ordel being the contrary of tidy in french, it is not the place where people can go look for woman xD
Edit : seriously the unreal forum censor french word but not english one?