This encyclopaedia contains lots of spoilers - you should play through the campaigns first before reading too much here!
Mechs
XanaPrime created a mod that added "Mech Warrior" style droids to Warzone...
To download the original mod (for Warzone 2.x) and see more pictures, visit XanaPrime on DeviantArt.
Per and Berg have updated the mod to work with Warzone 3.x versions: