This was designed to have max strength with less material using Fusion 360. The odd shape is because that is where the stress will be in the part, so this uses less material.
I find having a roll of butcher paper on my workbench to be very helpful to plan and design as well as catch stains, or just to do the odd math problem when my phone isn't handy.
Pic with cat is the only one I have :)
The author marked this model as their own original creation.