As it is right now no, UI customisation is not supported, but my guess is by S7 we might see that open up for basic customisation. There used to be a client side mod before the Terms of Service changes that allowed you to have color coded power buttons by weapon and class type (there is rumur it is being worked on again but I will need to look around and check where it stands when I find it) till then all you can do is resize and move the elements to best suite your visual play style.
Thank you for the reply. I remember reading some time ago the minimum resolution they were developing the UI for, and it was set at a rather low value. It would be nice to be able to reskin the layout better suited for larger resolutions.