I am not sure how many people in Europe own a Virtual Boy let alone a Virtual Boy in a Blockbuster rental case. But if such a person does exist they'll most likely need to replace the foam in their case. As the original foam disintegrates over time and makes a nasty mess every time you open the case. A good precut replacement is available from an american seller but it's over $100 before shipping.
So I went looking for another option, turns out there's a listing on amazon with the perfect sized pre-cut foam. I bought two 50mm sheets and glued them together with spray glue, this was to give me the option of having some stuff raised so it's not all at the very bottom of the case and it keeps it very close height to the original foam.
Here's how it turned out.