Here is the Doom 3 monster that has an adaptation to the Original artstyle. Doom 3, even as the black sheep of the Doom franchise deserved to have some of it's iconic stuff carried over into future Doom games, like with the Hell Knight design of Doom (2016).
As much as I like Brutal Doom and Project Brutality, Brutalizations should not be immediately expected as they are generally an afterthought when doing a new type of monster that the community would enjoy and use for their custom maps/mods. In the future, I may include brutal sprites for the melee commando in a different image file unless you're a good artist and wants to help with that.
*Doom belongs to (c) Bethesda Softworks & id Software*