Created this to allow for installation of the Power Acoustik CP-71W in my R53 Mini Cooper.
The radio is a little taller than usual and the regular dash kit (Metra 99-9302) has two guides that stick out on the top and bottom, not allowing the CP-71W to be installed flush against the dash.
Printing I used PETG to help withstand hot summer temps.
I printed mine at 20% infill which is still pretty flexible, so increase the percentage to increase rigidity.
Things left to do - make both sides symmetrical.
The author marked this model as their own original creation.