I'm not so familiar with MVL and the way it works, I checked Seby tutorials and those have helped me a lot, however there is something which isn't clear enough for me: what's the most efficient way of changing some map textures when the model is vanilla, Am I supposed to change the model too?
Open the .txd with TXDWS and change the images
You should copy the model as a custom object , then edit it's textures and finally use CreateObject function...