ui-hotbars

[pitfinder]

ok i did some ui writing in wow i was just wondering if any one has looked at what can be done with the hot bars and raid frames?
location orientation size and what not. how much control did they allow us?
like can i set a vertical bar in the middle of my screen can i manage the number of buttons on it the spacing of the buttons?
also has any one noticed if we can set up the raid frames to show mana along with the health? also has any one come across a way to change how or what types of debuffs are shown on the raid frames?

just looking at what can be done at this time so i can start working on my ui in the way of cleaning it up to see what i want and get more control over my hot bars.

i am guessing we can drop all the frills and extra images from the base ui?
also is any one looking at adding images to the ui to create a whole new look?