Hello, I copied the Ep3 engineer and renamed him to : rep_inf_ep3_engineer2 then I copied the BFX 501st Legion Engineer and put it in my rep msh folder.
But the skin doesnt changed here is my ODF :

"OverrideTexture = "rep_inf_ep3armoredpilot2"" , yes this is the 501st Engineer.

The skin just doesnt change when I copy a Unit that was already in the game.

Are you sure you load the right units in your lua? And have you made new .req files (and a new .req line) for the new engineer.
Edit: ?

thelegend wrote:Are you sure you load the right units in your lua? And have you made new .req files (and a new .req line) for the new engineer.
Edit: ?

Yes , because the engineer has a name like x08c67f5

try a clean and munge

doesnt work

It is likely that "OverrideTexture" does not work with that model. There are two options for this:
1. Copy the model, open it with a hex editor and change the name of the texture.
2. Do your 501st guys BFX-style by just adding the new model and textures to a new "side", make reqs for them, and then load them into the level after the standard ones.