/diy/ - Do It Yourself

I have this piece I'd like to make from 2mm aluminium sheet with laser cut. I need to put a box servo inside and secure.

The problem is ... the metal adds bending radius of 1mm and straight box just won't fit in, because edges of the box won't let it in.

How do I take that into account to fit the box in? I can't just make this piece bigger, it has to be secure on every side.