I am going to cut head part from the body, because it is hard to access mono-eye unit to set into the place.
1st, I add styroform plate just below the head.
Then styroform pipe is added top of the head.
The pipe is not attache the plate, only top of the head. I can secure the head part with screw from bottom of the plate.
after glue has dried, I cut all mono-eye shield frame.
the head part is detached.
Next, I will fix the pose.