The uploaded model is for a a 68cm wide and 54cm tall opening window

I expect it to fit basically no other window. Solidworks file are included for modification.

The window insert uses M3 heatset inserts and M3 x 12mm bolts.

The top part of the insert is a compliant mechanism to clip into the window frame

Hexagon pattern is 2cm wide so the cat's paw will not fit

Cat for Reference (Fig 2)