I found that the research helped me in creating both of my HUD's as the positive and negative elements crossed both genres between the childrens audience of Meg and Mog and the young adult themes of Harry Potter.
http://www.classicsys.com/css06/cfm/article.cfm?articleid=20
http://cgswot.com/tutorials/vfx-tutorials/162-32-designing-a-compositing-a-hud.html