Here the final models (this time using skynet, as suggested by someone before, hoping that it doesn’t gain self-awareness):
v.1.1 rubber case
https://skynet-send.hns.siasky.net/#b-AAD-lZW0EF5OFRto-Dx3H3-9T2aX4ojS5aJgGS0VDBtW_Q+ZXbQpn84XoT7J+P2+JFAYNFYQLv3kSFq+qqb6IwownVThKQuT1VJj/R3sZHfAwkR
v.2.0.3 rigid case
https://skynet-send.hns.siasky.net/#b-AADe7gsigNQqX86suQh0QL4Ryb0OkqYp-cGzJ6AeYqP4uQ+dnJMgOfttvtZdTHfUW0uO5c2hZDeThA+CO3y38BGiSKZDOmJJu+BYo0jc9uJNqXB
The last is the one tested by @JR-Fi, with splits width increased, upper hole added and cooling holes (not sure they will cool down but they are cool).
The first incorporates all the modifications except the increase of thicknesses and internal dimensions (which are the same as measured on my phone, making it pretty snug). I do not exclude that further adjustment may be required.