The one that looks like a best fit for me so far is Tallcraft: http://www.lotrointerface.com/downlo...TallCraft.html
The author even says it's a simple enhancement instead of a full new UI. What you describe sounds perfect -- it only needs to be thin enough not to block a clear view of the player (for the purpose of moving around without having to close the window) and it could take up most of the vertical space (hopefully not all, but most is fine). The "improvements" Turbine made don't really appeal to me, and I'd really just rather have it back the way it was, and taller if possible (so more of the recipe list is visible).
See the pic at the Tallcraft link for a very good idea of it. I play windowed, so I guess it's custom a bit smaller than 1280 by 1024.
If you do decide to look into this, I thank you greatly sir!