Unzip this into your MAIN everquest 2 directory. Into "\EverQuest II" based on what you've told me. It should prompt to overwite the UI directory and (if you had it in the right spot) the eq2.ini file. Say YES overwrite.
Since this comes from my current working copy it has my latest hotbar window in it, so I guess I should explain how it works
First off, its designed to have borders on at all times, and set to opaque. You won't actually see them really due to the way its designed but you will want them on. To toggle the bank selector mouse over the left edge of the window and you will see a small portion of the border light up and the tooltip will say "Toggle Bank Selector" or somethign like (don't recall the exact wording). Click it to toggle the selector. To move the window either click and drag in an empty slot, or if you move your mouse between slots you will see the cursor change and you can drag the window that way.