This is completely amazing! Just started looking at HTML5 UI stuff today and am so happy to find projects like this that look so promising! If you might indulge me an answer: What WYSIWYG editor would you suggest for creating HUD… components, i guess you would call them. (I know absolutely nothing about coding in any language). Specifically an editor that can have videos with alpha integrated (so as to have cool effects on certain parts of the HUD) 
Oh, and this is definately going onto the Mega Collection when I next update it