So the second crewman now has a new head.
The head was removed by using a razor saw to cut the wrists and a scalpel to remove the head.
After cleaning up, a hole was drilled to take the neck stub of the replacement head.
The right wrist was trimmed back to allow the head to fit.
The left hand will be sculpted below the helmet (covering the left ear) but I could not get the right wrist to align so the figure will be bracing the helmet with the right hand.
Sculpting the hands comes next.