Hello, I like the work you are doing. The current UE4 UI is visually a bit too cluttered and wastes too many pixels, and is also a bit distracting, and yours is surely better in those aspects. Also, while it will always be probably true that, for full productivity, large / multiple monitors are needed, this does not mean that UE shouldn’t be more usable also for people with laptops. So please go on, and Epic, please listen! 
While I am at it, I think also that one of the UI issues with UE is the lack of support for retina/hiDPI displays, which makes the UI poorly readable and frankly, out of time in comparison with all other software out there. Just open last Unity in your retina display and see how better it is in terms of readability and use of screen estate. By the way, it seems to me that retina support was under consideration for UE 4.15 (or was it 4.14?), and now I don’t see it mentioned anywhere. Does anyone know something more?
Finally, are you changing just the visual style or also the layout / positioning of UI elements? I have some ideas, if you are interested.