Campaign Creations

I need help! I'm trying to be able to make the unused things (raiders, mercenary gunships, etc)  make-able! I don't have anything to use as a raider, biker, gunship, or anything else! Instead of being the guys I want them to be, they show up as marines, wraiths, and vultures... Can anyone help me? Any help would be great...
btw, I'm using Brood War patch 1.15.1

The raider, biker and gunship do not have their own sprites, they use the sprites from the marine, vulture and wraith.

I know theres beta models for the raider and gunship if you look around hard enough, as well as their wireframe models (prob in the sc mpq if I recall). You may have to do a bit of iscript editing to get them to work though.