I have found a way to make the Eagar Rice Burroughs 4 armed Green Martians. I used a box of GW plastic fantasy Orks. I use one set of legs, two torsos, four arms and one head. I also used the extra rifles from the GW skweets, I had ten left over.
I glued one torso to the legs and carved off the neck stump and carved back between the shoulders a resting place for the next torso. I glue the second torso into this resting place. Fill in the gaps with putty, I actually use wood putty. For some figures, I use the shield fronts and glue them into the bottom torso in the place where the head was cut away.
I use the right arms with spears for the rifles. I cut away the spears and drill a hole for the rifle in the hand. Cut the rifle in half where you want the 4-AGM to hold it. Since the hand of an Orc is very large, you need to only glue enough of the rifle to hold it place. Glue the long part of the rifle first to the top of the hand. Glue the rest of the Rifle, usually this is the stock, to the bottom of the hand. Now glue this arm to the top torso, so that the 4-AGM can shoot the rifle. The rest of the arms with weapons I glue to the remaining three places of the two torsos.
Choose a head and glue that to the top of the torso. A lot of the heads have tusks which make for a fierce 4 armed Green Martian Warrior. With so many heads and different weapons each 4-AGM is unique.
I am up to 20 warriors and one Jek for my Martins force.