The question is simple, how do you go about creating a UI? I'm currently tinkering around a new one, and thought about how I always make my UIs in the exactly same way. Following that train of thought, I was wondering how all of you do it.
Personally, I always start with just enough addons to hide away all the Blizzard stuff I don't want (usually all of it, except perhaps the chat window). Then, I go on to the bars, first the action bar followed by the cast bar. After this, I'll go onto the unit frames. After this, buff trackers, raid frames, encounter addons, SLDT and the Minimap follow suit. One of the last things to fix in terms of placement is buff bars. This, however, is all placement and size. No design is involved during this part.
Once I'm done with all the above, I'll generally start designing the UI. This includes, but is not limited to, the general colour scheme, textures, button skins, the whole works concerning the aesthetics. And then comes the endless tinkering with stuff that isn't immediately visible. Stuff like bag addons, map addons and the likes.
And, for some odd reason, I always finish off with the chat window. Don't know why, I just do.
So... what do YOU do?