I could make interface things like buttons but make them similar to MC's GUI if you need those.
I've got both 1.8 prereleases on my HD.
This looks like a nice program, I've been collecting legal Minecraft's jars (with and without various mods) since 1.5.
The download link appears to be broken though, due to an ellipsis being inserted into it. I most likely wouldn't be able to use it anyway since it looks like a Windows-only program and I'm using Linux.
If you have a good CPU, search for "minecraft water shader", that's a great mod.