You can also just place the creature in the map, set its drawscale to the size you want, then set its collision to nothing...make sure that "game relevant" and "always relevant" are true, and set "force stasis"=true, "stasis"= true, and maybe "travel"=false.
you can then place a "block all" in, set for the collision you need...don't use the collision of the creature, or he will bleed when hit....youll still have to find the animation (pose) you want for him...