The UI is always a matter of personal likings, so is your choice of fonts for chat, dmg, buff timers or unitframes. But for the sake of consistency you should keep it to a minimum of font types.
Speaking of minimalism I wonder what's your intention of having 3 (in words: three) different combo point displays. You could safely just kill Nugg und Pitbull's dots and stick to the text-based combos on your target frame.
Especially as being a rogue, you can hide most of your action buttons as I am sure you know your main CP-bulders' keybindings by memory.
I would also recommend to NOT use any sort of viewports or huge plain black backgrounds behind actionsbars, buffs, chats and so on.
Of course this is just my opinion and you are free to design your UI it suits you most, but if I may just give you an advise: Find a style for your UI you can apply to all (or most) of your NEEDED addons to make it look great ;)
# Edit: don't pay attention to spelling mistakes whatsoever. Ze Germans ...

