First, you need to get model you want to convert to matte, and import it into Zmod 1.0.7, then export it as *.3ds, then import it into 3ds Max 5, rescale it by 10025 and assign proper material - you can use the one of material that JC uploaded there, but without chrome. Then export it, and make a loading order in rpk.
Pretty easy, I think 😃