With Paper & Pen RPGs you don't need proper models to represent things. It can help with immersion and all, though.
Now, the thing is, I'm not going to buy a pack of Plague Bearers for one or two encounters when I dont play Chaos or Daemons, so would it be acceptable to use the Paper Waaagh style cut outs for Roleplaying combat?written so you can use a tactical map and 28mm miniatures whilst playing combat.