0,2 mm, no supports, 3 perimeters for more rigidity. Don't forget to mirror STLs for opposite handle before print.
Remove built-in supports from body_L and body_R.
You need 2 pcs of mirror: 50x50 mm thickness 3 mm. For example: https://www.aliexpress.com/item/1005003917559444.html
You'll need some other small hardware:
Recommended is to paint inside of the periscope black to prevent unwanted reflections.
The author marked this model as their own original creation.