Actually, the thighs are different on all variants, so the only parts that are common to all 3 are from the knees on down. Oddly enough, (torso) parts from all 3 don't really intermix very well: you could adapt the shoulder/weapons vest from a tomahawk to the defener, but the inverse is not true, because the center "body" unit is slimmer in width on the defender. Shoulder/arms/missile pods should be fine for all 3 though. As things are now, molds are almost done; I'm just waiting for a decal confirmation from Devin, and I'll start happily taking your money