Cusa has a different design requirement hence a different design.
This looks good but I don't think there is room there for the Keyrah (I could be wrong though). You probably should have used a 2.5" hard drive so you could move the MB a bit to the left giving more room.
CUSA is trying to make a product they can sell in quantity which rules out reusing existing C64 keyboards, cases to reduce costs. They simply are a finite quantity that you can't guarantee numbers using to base a sellable product on.The use of their own keyboard also means no need to leave room for keyrah in there which helps in their layout. For one-offs though, they are a good choice for a hobbyist making a small computer project.
Both designs have merits.
