Jay,
Nothing as of now is draggable. On window expansion, the right hand column expands, and the preview and gcode readout expand, as with their toolbars.
The code is now modular enough, that moving panel blocks around in the layout is simple. I prefer to keep all machine controls left justified. However, shifting the machine controls to the right is easy. This is a personal preference, and has more to do with where your monitor is situated in relation to your machine and your workflow.
I could throw spindle speed on there as well. I don't currently have digital spindle speed control on my machine. One of these days...
The monitor I have is 1440 x 900, which is 16:9 widescreen. So the overall layout is a little less than 900 pixels wide. This layout won't work on a 4:3 monitor, or a monitor with any less of a resolution. Getting Ubuntu to rotate 90 degrees was a little difficult.
Also, this layout wouldn't be right for the use of a lathe, I would think. As I don't have a lathe, I am not quite sure what the work flow preference is.
The workflow of this layout is top to bottom, instead of left to right.