Design help - irregular shape

[rosparovac]

Hello everyone
I recently bought an electric car and found that simply cutting a piece of plastic can unlock bonus transfers More information here. Unfortunately, the original part is unreachable and if you can get it at a nonsense price (140EUR). I want to create it and share to thinginverse to help EV comunity. But this shape its so iregural that I dont know where to start.

Can you give me some hints?
Or the sequence to design it?

[TheMarkster]

Hello everyone

Your images don't show up. You can attach them directly by drag and drop as I have done here for you.

The lines are 10mm apart?

Edit: I deleted mine since I see you fixed your post while I was doing it.

[rosparovac]

Hello everyone

Your images don't show up. You can attach them directly by drag and drop as I have done here for you.

The lines are 10mm apart?

Edit: I deleted mine since I see you fixed your post while I was doing it.

Lines are 8mm apart.
Thanks for your time!

[rosparovac]

I forgot to take a photo of inner side. But the inner structure dont have to be precise.

[kisolre]

Here is something to get you started:
.

PlasticPart.JPG (87.61 KiB) Viewed 226 times

[rosparovac]

Here is something to get you started:
.
PlasticPart.JPG

Thank you!