Loriano tried a lot of keyboards before he found the right one which fitted perfectly in his case (you can see several keyboards in the video on Kickstarter).
For the keyboard that he chose Loriano has tried to ask different layouts to the factory house, but they wanted a minimum of 25 keyboards ordered for each different language
So Loriano decided to buy professional stickers to offer for free to buyers of his case: in this mode he had the opportunity to satisfy a customer who wanted russian layout
Also Loriano offers for free a complete set of classic Amiga Keyboard layout
See the pics of the stickers in his page: