Sheet metal tricks would work here, as long as that bend is “conic” (generally: part of a circle)f
This is a relatively simple part – I’d redraw it flat from scratch. You’ll need to decide where the bend happens. Does the top-side compress? The bottom side stretch? some of each? For a curve this shallow, you can probably assume it happens in the middle of the thickness. Measure the arc-length between the holes at that depth.