Hi Max,
With regards to dimensions : The construction of the Bumblebee case as compared to the Themes case is not exactly the same because of the manufacturing constraints of the different materials of forged carbon, steel, and ceramic, and their comparative strengths. Hence the small differences as you mentioned. The overall thickness differs by approx 1mm. ie, the Steel ROO is about 14.25mm thick and the Bumblebee about 15.25mm. However the difference is hardly noticable to the eye...
Cheers,
Rob