Start with the legs. Pick out a set of legs and glue it to a base.

With the legs secure to the base, choose a torso and glue it in place.

Glue the gun arm to the torso in a level position that's nearly parallel to the ground.

Next, glue the corresponding gun carriage into the three holes on the gun itself.

Glue the corresponding arm to the torso.

Add the head of your choice.

Add a gun detail to he peg hole, like this extra rocket, to the side of the gun itself.

If you wish, clip off a targeter and glue it to the start of the gun barrel.