Okay, Thank you. I will try to use some effect on layer!
About the option just to force loading texture for model from external source image and then option to refresh that model would be atleast a milestone I would like to achieve. (For example: Changing Skins for model like in GTA 3-VC).
I guess the true solution for this idea would be possibility to use diffrent objects and materials from inside model.file but I think that it is a much harder to make so if you make just this idea above I would be very grateful!