Found that building the UI's in code is very, very tedious so I opted to develop a simple UI Builder type of program. After about an hour of coding this is what I've got so far. Doesn't look like much but you can reposition and resize the Window. Subsequent versions will include a basic properties panel where the user can change the window size and title and add new control's to the window.
Ultimate goal is to have this output to XML files as a basic save/load type deal and when ready 'compile' the XML into C++ source that I can simply plug into OutpostHD's code base and add the game specific logic to the UI panels.
I'm not expecting this tool to be anything spectacularly awesome, don't want to spend too much time on it, but it should be functional enough to ease development of the rest of the UI panels needed for the game which I've been putting off because of how painful it is to do it from scratch by hand.