FPV mask with diopter lens

Build a FPV mask with my 3d printer that fit nicely my face.
Since I can't use standard googles with two separate lcds I was forced to modify commercial mask to fit my eyes.
So I first build a template to align my face and the center of my eyes to the monitor and lenses in order to find the suitable lenght.

I made several prints to check the proper alignement and a lot of scrap printings - see photo.
I found these dimension as a best fit:
Inter pupillar distance 60mm (lens are 55mm diame