All along, I’ve been assuming the A500Mini will be the same 50% scale that the C64Mini is
Thanks to https://youtu.be/h552-eR0cGA Retro Recipies
And https://youtu.be/igEpW8QJFQ4 8abit guy
I’ve been able to get an idea of the size of the A500mini

Using the USB socket size to scale, they’re about 13.2mm in real life.
We get about 186mm for the keyboard width.
The real A500 has a keyboard cutout width of about 450mm
186/450 = about 41.3%
So, summary, it’s closer to 40% scale than 50%
And, I gotta figure out a whole new way of keyboardification:-p darn you rascals at Retrogames LTD :-p