I very much like your cube with the molecule type thing coming off the top I'm wondering if there are any other molecule type structures that might look good up there.
also I'm wondering if you can insert a scalpel blade between the E and x Ex where a natural arrow occurs, i suggested this to another contestant already who has done this but it was my suggestion so I'm not sure if he or I own the rights to that, there are different scalpel blades shapes that could be utilized and u can see them on google images the have numbers, 10 blade, 15 blade and 11 blade.
let me know your thoughts