From now on I'll be using Ender's client as a base to fork from and build my client so my minimal UI will likely start becoming intertwined with that over time.
That said here's a zip to make using the minimal UI easier:
http://protectorworld.com/files/hnh/minimal-ui.zipSimply extract into your client base dir and run either of the .bat files to play with either minimal UI or default UI.
I've also put up a much smaller implementation for Ender's client (Or any other client that has a res folder for overriding) which you can download here:
http://protectorworld.com/files/hnh/res.zipJust copy the res folder to your main client directory and you're done. Using this method means that things won't get over written and if changes are made to the builtin-res file later it's still compatible.
Eventually I'll probably have something a little more integrated but I haven't really done much more with it since the last post (Just re-added a center flair to resize the chat box, whoops) and I'm busy playing when I have free time.