The supported layouts for the happy case are 1, 1.5, 7, 1.5, 1 and 1.25, 1.25, 6.25, 1.25, 1.25, 1.25. There are probably more because it's the same universal bottom row that the normal case uses and the GH60 has some weird bottom row options but the two I listed were the ones I had it mind making the case. I could add the proper 6u space option if there's interest but I don't really see a point to adding a useless spacebar option.