But still too small changes to call modified work as your mod, as long as there's most of original creator files or just only few but without permission. Change them please because it's noobish and not pro to mods based at another modder's mod. This isn't way to growing modding skill, popularity, mark of you as experienced or newbie modder. Remeber, Modding is Art (independent mapping too, but mapping in general is important part of modding in every game) sometime as elite artistic job and hobby, not plagiatory and ready-made pop-art product, doesn't matter if this is modification for Soldat, Half-Life 2, Doom 3, F.E.A.R., rules are same at all.