my personal suggestions:
1. PAINT! PAINT! PAINT! Make sure to pull the case apart completely, and paint all surfaces, even those you don't normally see. should any light hit the back of the panel and it not be the same colour, this may affect the effect...
2.
PSU RECOVERING!....this includes bpth wrapping the wires and changing/modding the
psu cover. No point in a plain grey box in a fancy box.
3. ROUNDED CABLES! These will improve airflow in yours case, and make it more pretty. Lots of colours to chose from...find some that suit your taste...GLOW-IN-THE-DARK or EL-lit cables always do a good job.
4.....add another cathode to the top of your case....and make sure to use the same inverter, or buy a second that has a dual inverter.